Chevy 305 Rough Idle















3, built Feb 2011. Combination street and drag. When one or more of these variables is off it can lead to a rough idling condition. very rough 992 comment: heavy lope. I went through the receipts and the previous owner purchased a new long block from a local parts store back in 2004. My 1991 Chevy Silverado starts up ok, but has a rough idle until it warms up. I have a 1985 Chevy c10 with a 305 and a 4bbl Rochester Quadrajet. runs down the road great!. 510 Lift 318 Dur Hot Street Rough Idle. at a rough idle, the stock can will “dither” in and out in response to the rapidly-changing manifold vacuum, constantly varying the amount of vacuum advance, which creates an unstable idle. Cars idling rough at stops can have many causes, including damaged sparkplugs, improperly installed sparkplugs or damage to the car's fuel injector, carburetor, vacuum hoses or ignition wires. I have pulled the vacuum line to the fuel pressure regulator and there was no fuel coming out and the FPR was dry. Thank you for visiting The El Camino Store web site. to prevent any. it gets a rough/erratic idle like it wants to die, exhaust stinks too. 7 Vortec that I think I’ve figured out. of it on youtube search rsh4364 then look for 1009 rough idle. Idle air control valve uses a polymer blended, isotropic neodymium/iron/boron magnet to provide accurate control of the pintle and airflow ensuring accurate operation Every idle air control valve is manufactured with epichlorohydrin material to withstand resistance of vehicle temperatures ranging from -40 deg. Over the last 18 months I have had problems with it getting hot (not engine coolant) and not starting after driving for a while or running a few errands of 10-20. A lot of times the Vehicle Manufacturer will release a Technical Service Bulletins (TSB’s) related to a rough running or Misfire condition specific to your vehicle. 9L) - Rough idle, stalls, loses power after it warms up - For the last few days I've been experiencing this problem where the truck operate normally when cold in the morning, but degrades after I drive it for a while. Anyone have an idea of what could be. It’s highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. Good mid-range to upper RPM torque and HP for +540ci modified engines with aftermarket tubular, dry, above water exit exhaust systems. For use with manual transmission or high stall automatic. 350 TBI/auto Rough idle & hesitating Everything was good until I stopped at a red light and the idle dropped really low and rough, when the light changed I tried to accelerate but had no power, stumbling and hesitating, felt like I was running out of gas but had almost 1/2 tank. I figured it was time for a tune-up, replaced plugs and wires. It started with the engine light being on for a while, with a slightly rough idle but otherwise ran great. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. With the "Rough" idle cam, the vacuum will be under 10". I have an 82 K10 with a 305 5. Search our online idle control valve catalog and find the lowest priced discount auto parts on the web. Welcome to the Chevy Check Engine Light codes page. Chevy Forums FREE technical assistance for your restoration and repair. chevy forum at Car Dealer Forums; I have an '86 GMC 1/2 ton pick-up that now has a 5. 91 camaro 305 tpi runs rough at idle sometimes stalls and has power loss - Chevrolet 1991 Camaro question. I do have a rebuildable IP core. No codes and many parts later still will not idle in closed loop. Re: Chevy 305 has rough idle at 8 degrees timing but gets smooth at 16 degrees - 600 Yes I have, I found the port idle screw to be a lot more sensitive than the starboard idle screw. 8 v6 cause these issues along with stalling at light and when shifting into gear. I recently purchased this vehicle. My 94 chevy truck with a 305 idles at 500 rpm in drive with brake on. On cold start up it idles rough, until. Many customers who come to us learn that, despite a previous diagnosis, they don't need a new engine, only certain repairs or adjustments. Average repair cost is $350 at 112,750 miles. The Chevrolet 305 also became the standard V8 in GM's C/K truck series, and was even used in the Corvette for one year in 1980. A really serious leak can lean the air/fuel mixture out to such an extent that an engine won't idle at all. 7L 350 V8 in the alt. If you advance the timing - the idle goes up. At (somewhat rough) idle, a blip of the throttle causes the engine to bog. 533 Duration: 313/328 Duration @. Combination street and drag. Rough idle. After checking carb, replacing plugs setting timing I went to the distributor "prestolite mechanical". I have a Chevy 1994 C1500 with a 305 engine that idles rough RPM drops almost to 0 then it surges. 1988 Chevy 5. Post 2113409 - Get all of your tech questions answered on the net's largest community for hot rod and muscle car enthusiasts!. 350 TBI/auto Rough idle & hesitating Everything was good until I stopped at a red light and the idle dropped really low and rough, when the light changed I tried to accelerate but had no power, stumbling and hesitating, felt like I was running out of gas but had almost 1/2 tank. Other times won't start for 2-3 minutes and then only with the accelerater clear to the floor. [SOLVED] extream high idle problem on 1990 chevy 1500, 4. Find many great new & used options and get the best deals for Chevrolet SBC Chevy Engine Pro Very Rough Idle Stage 5 HYD. It stalls whenever you turn the truck sharp either direction. The truck idle drops and lopes. It stumbles badly off idle and at mid throttle, but once up and going seems to run fairly smoothly. 1989 chevy 1/2 ton pickup, 305 engine. 1993 GMC/Chevy 5. If you let off the gas it dies. Chevrolet Colorado Suspension Problems. Hey guys, chevy 350, mild cam, hei dizzy I am having an issue getting my timing dialed in. Cleared code a couple of times, returned as 305 or 300. I'm thinking of doing the same thing, new 350 in my 91 Sierra 4x4, considering it has 151,000 plus miles on it, mostly hi-way. The 1996 Chevrolet Silverado has 1 problems reported for runs really rough. Also this engine will need headers and performance exhaust system. I had a similar problem (see this topic) on an '04, 1500, 2WD, 4. Sometimes will start again immediately. Combination street and drag. 0 Vortec with a PO300 random misfire/rough idle issue. The 1990 Chevrolet Corvette has 2 problems reported for will not run in closed loop, rough idol. ya I know the feeling if I double dose on the 2 stroke oil it idles a little better for a short time but still drives me nuts Funny the same mechanic from GM that told me that's a normal idle is the one that put the injectors in under an extended warranty and screwed them up, I had to go back in and deal with them myself He forgot to tighten down the wires on top of two injectors so it limped. I just had the plugs,wires,rotor,cap,and starter replaced. 1989 chevy 1/2 ton pickup, 305 engine. 7 tbi runs rough cold and Discussion in It runs fine at or around idle its when you are going down the road and it is not at operating temp that. Comp Cams 11-601-4 Big Mutha Thumpr Cam Bbc Big Block Chevy Thumper Rough Idle. In addition to this setting the idle speed too slow can result in very low oil pressure when the engine is hot, resulting in faster wear and possible seizure. It's not. It stalls whenever you turn the truck sharp either direction. hey john i stay in indianapolis and have the above rough idle at any rpm below 900 and hard cold start issues with carbureted 1968 307. You will notice a racey idle with the 280-grind while the 292 and 305-grinds will produce a rough or ''rumbly'' idle. The port side will kill the engine if closed where as the starboard side will make it just run a bit rougher when closed. I don't have a tach, but my ears tell me it yo-yo's between 300 and 1000. For use with manual transmission or high stall automatic. Or maybe IP timing is off. Comp Cams 812-16 High Energy Hyd Flat Lifters Set Chevrolet Sbc Bbc 305 350 454 292h 2500-6500. Anything less than 1000 RPMs engine idles very rough. #'s Matching. A really serious leak can lean the air/fuel mixture out to such an extent that an engine won't idle at all. [Note: OEM plugs were DENSO platinum type]. The check engine light has come on twice, but went out on the next drive. I have spent almost $1000. A rough idle or stalling. Now lately my idle remains at 900rpms after the engine is at operating temp. Buy SB Chevy 283 327 350 400 Hi-Perf RV Cam & Lifter Kit. Speed Pro CS187R SBC Hydraulic Camshaft. it also seems the longer i sit the worst it gets. Take your truck to the next level Rough Country’s 6in Lift Kit for 88-98 GM 2500 Pickups. I dont know y it's idling so rough it only does this when it starts to get warm so i dont know what it is. Chevrolet Hydraulic Roller Camshaft Find Your Camshaft Chevrolet - 262, 267, 283, 302, 305, Street/strip applications, rough idle, 2500 stall required. 3s from 99-05 range. 3, built Feb 2011. I have a problem with a 98 Chevy 4x4 5. I found the factory set-up was a bit rich off idle on the 1405, for the 350. But if after testing, it is determined that you need a engine, We can take care of you at our facility. 8 v6 cause these issues along with stalling at light and when shifting into gear. Didn’t fix the issue. IAC Idle air control valve cleaning 87-95 TBI 305 350 Sierra Silverado Caprice Chevy Tahoe 5. Keyword 12013 F 150 3 5l Rough Idle. A big part of the 302 vs 305 hot rodding came that a 351W will not fit in place of a 302W, but a 350 SBC will fit in place of a 305 SBC. Chevy had a service bullentin about it years ago. 1989 camaro 305 run rough and won't idle. It is stallish, and surges in neutral or park at idle (revs, then drops off, then revs again). 7L, TBI, 260K on the motor at idle, it's extremely high, around 1600-1800 RPM's when put it drive, drops down to about 1000-1200 (still way too high) I've put a new IAC (idle air control) valve in, checked my timing. Spits 1989 Camaro with stock 305. Average repair cost is $350 at 112,750 miles. 7L Rough Idle/No Power Posted to GM Driveability on 4/3/2004 20 Replies The customers complaint was while driving it started to run rough and no [] car off did his business then went to go home and was hard to start, cranked fine but hard to fire up and idled rough. sometimes it dies). Took the truck out and drove it kinda hard for about an hour. Good mid to high rpm torque and horsepower. - Hello,I am a new member. Categories: American Classic Cars | Muscle & Pony Cars. 09-02-11 08:52 AM - Post# 2132906 This all just started happening outta the blue. - Chevrolet 1989 Camaro question. 7 350 rough idle 231,000 miles. Chevy Silverado and GMC Sierra Stalling Problem My 2000 chevy started this problem 2 days ago. Rough idle and ticking. Chevrolet Sbc Chevy Engine Pro Very Rough Idle Stage 5 Hyd. If the idle air control valve is malfunctioning, it will cause the engine to idle rough, too low, too high, or irregular. com Car Chat > Chevrolet > S-10 > 1990 s10 cold idle problems. -Mix screws are 2 full turns from tight. 050": 244/254 Lobe Separation: 112 LC. the jerking will go away if I give a bit more throttle to it. An EGR valve that is stuck open at idle can have the same effect as a vacuum leak. Combination street and drag. 305 350 400 Small Block Chevy Ultimate Cam Kit. GM Throttle Body Injection 1987-93 LO3 (5. However, if throttle body is replaced AND a proper idle speed cannot be obtained, there is an adjustment which may be made. 0L F-body (Camaro/Firebird) MAF TPI. Hi! I am at the end with this truck! 1989 chev TBI 305 k1500. Dirty Fuel Injector Modern vehicles are fitted with fuel injection systems, which inject fuel into the cylinders to create a mix of air and fuel to burn. 050 (CK1002) In Stock Small Block Chevy, 305 327 350 400 Ultimate Cam & Lifter kit Street Performance 214/224 at 050. What is the correct idle on a 1991 Chevrolet Camaro with a 305 TPI V8 1991 camaro rs v-6 3. For use with manual transmission or high stall automatic. 54; Stage 3 RV HP Hyd Camshaft Kit Chevrolet SBC 305 327 350 400 480/480 LIFT. Appears a fowled plug or plug(s) on the passenger side was the root-cause. I opted for a new ACCEL with a hotter coil that has a 4 pin module. Average failure mileage is 68,400 miles. 7L/350 Standard Motor Idle Air Control (IAC) Valves and get Free Shipping on Orders Over $99 at Summit Racing! Standard Motor Products replacement idle air control valves help you get maximum fuel efficiency and powe. What causes a rough idle? A rough idle can be caused by many different car faults. Rough Idling and dies when weather gets cold I seafoam it, marvel mystery the gas tank, put Rislone in the engine to keep the infamous ticking low, Set the timing,new cap,rotor, intake manifold gasket, fuel pump spacer, wires,sparkplugs, and oil change. The job of an idle air control valve is to regulate the car’s idle based on how much air gets into the engine. We specialize in a wide-variety of high-quality car parts and accessories for your car, truck or SUV. i have a 1995 silverado 5. 1990 s10 cold idle problems. If the engine will not start when the engine is hot, the choke may be stuck in the closed position, typically due to a lack of lubrication. I bought it with a blown turbo and replaced that along with the timing belt and still had a rough idle. If I ease into the gas it takes off fine. Engine: 455 Carburettor: holley 750 vacum secondaries 4160 series Ignition: Pertronix flamethrower HEI This started happening recently, i start the car, use my rigth foot as chocke til it runs properly at idle in park, now; the car will idle just fine at rigth under 1000 rpm, if i pres the brake the rpm wil drop a hair, but dont die. Categories: American Classic Cars | Muscle & Pony Cars. I was gonna just turn up the idle screw, but there is no access to the head of the screw 9welch plug. It's not. 1990 s10 cold idle problems. Suddenly developed power loss under load. GM '73-'87+ Chevy/GMC. On a 91 camaro tpi 305. After the truck ran for a couple of minutes the idle seemed to smooth out. It stalls whenever you turn the truck sharp either direction. 09-02-11 08:52 AM - Post# 2132906 This all just started happening outta the blue. I replaced the damper correctly only to still have some engine vibration only at an idle. Find many great new & used options and get the best deals for Small Block Chevy Engine Pro Rough Idle 305 350 400 Cam. 7L Automatic, 22000 mile, that runs fine when I get on the gas but 1990 Chevrolet Corvette ZR-1 cleaned the throttle body, cleaned the fuel injectors, it still runs rough in idle when it warms up. Solid Flat Tappet Cam. Must upgrade valve springs. Well, the exhaust pop-ing & rough idle appear to be eliminatedat least during idle & revving in Neutral. The EGR valve is a circular metal component with a vacuum hose coming off of it. I bought it with a blown turbo and replaced that along with the timing belt and still had a rough idle. F to 257 deg. Dealer replaced motor mounts and seem to fix the problem. I just installed a timing tab and it look like the balancer has slipped because good clean idle sits at about 50 BTDC (almost at the very top of the balancer). The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there?. Once it is warm, it runs good unless you try to accelerate real fast. I've seen this solenoid referred to as an A/C Idle Up Vacuum Switching Valve (VSV) in some manuals, but Chevy's terminology may be different. But if after testing, it is determined that you need a engine, We can take care of you at our facility. ----- Effects of Gasoline Additives On Carburetor and PCV System Performance As They Relate To Exhaust Emissions First Year Report APRAC Project Number CAPE 2-68 Scott Project #2807 Prepared For Coordinating Research Council, Inc. A performance cam with lots of valve overlap can give an engine a lopping idle, but so can a vacuum leak. I adjusted the carb and timing and found no vacuum leaks, trying to figure out why the idle is so rough. 350 vortec rough idle. PowerMax Hydraulic Roller 210/224 Camshaft for Chevrolet 305-350 LT-1. Hello, this will be my first post to the forum, so let me say thank you for all the help. I’ve had a rough idle problem with the Chevy 350 engine in the van and haven’t been able to solve the problem for over a year now. 7L) engines. Mine was a 5 pin and that failure symptom is common in the 5 pin. Browse Categories. The J-Body Organization, j-body. Rough idle Chevy 4. A big part of the 302 vs 305 hot rodding came that a 351W will not fit in place of a 302W, but a 350 SBC will fit in place of a 305 SBC. This is a discussion on 1996 Chevy K1500 5. Must upgrade valve springs. Once it is warm, it runs good unless you try to accelerate real fast. truck sat for 3 weeks and started this. Idle Air Control Valve - 1AISC00030 This item seems to have fixed a major stalling and rough idle problem on my 1986 Chevy Astro Van. 0 TPI with an idle surge/stalling problem. 7L Engine Miss. Sometimes will start again immediately. Rough Idle Just thought I'd solicit some thoughts on this: when sitting at a running idle, after the engine (LB9 305 cu. We offer high quality new, OEM, aftermarket and remanufactured Chevrolet C1500 Camshaft parts. I’ve had a rough idle problem with the Chevy 350 engine in the van and haven’t been able to solve the problem for over a year now. 7 350 rough idle 231,000 miles within the Automotive Support forums, part of the Tech Support Forum category. I have a 1996 Chevy Lumina LS, 3. 350 chevy idles rough and runs rough? My 305 did that, it's an early '80's. I've been using a vacuum gauge to adjust the idle mix screws and base idle to get the highest amount of vacuum and have succeeded in getting a really stable/high vacuum readings. To see how frequently Chevrolet Colorado problems occur, check out our car reliability stats. Intended for performance oriented vehicles that will see little street use. If there is an open or short in the idle air control solenoid, wiring or driver circuit, or the idle speed it out of range, it will usually set one or more fault codes and turn on the Check Engine light. public wholesale herbert pricing ---- 2 days only !!!! you don't want to miss this!!!! friday and monday, phone orders only. The 1996 Chevrolet Silverado has 1 problems reported for runs really rough. rough idle on truck - i got a 1996 silverado 5. 305 4bbl, all original silver metallic with gunmetal vinyl top. 7L/350 Standard Motor Idle Air Control (IAC) Valves and get Free Shipping on Orders Over $99 at Summit Racing! Standard Motor Products replacement idle air control valves help you get maximum fuel efficiency and powe. Couple that with very few (no?) 351W high output motors were offered by Ford and you had a plethora of Corvette, Chevelle, Camaro 350s ripe for the pickin, and the 305 Chevy was the odd man out. Good mid-range to upper RPM torque and HP for +540ci modified engines with aftermarket tubular, dry, above water exit exhaust systems. These camshafts works well with. I have a 2013 chevy impala V-6 300 HP: my Question Is when my Car is started first thing in the morning or when it sits for 8 hours when I start it the idle goes up and down by 300 rpm does not stop. 29, 2016 Title 49 Transportation Parts 400 to 571 Revised as of October 1, 2016 Containing a codification of documents of general applicability and future effect As of October 1, 2016. Chevy 305 Engine Runs Rough with EGR Enabled Chevy 305 Valve Issues Classic. As a starting point I repaired one of the vaccum hoses that plug into the throttle body. It won't idle. Open the hood of the vehicle and locate the EGR valve. It then jumps back up to about 750, but idles rough. Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400 Performance level 1 - Mileage Compu-Pro - These cams are designed to enhance throttle response and low-end torque in vans, trucks and passenger cars while delivering fuel efficient motoring. Cold stalling problems are the most common because the engine needs a richer fuel mixture to maintain idle speed until it warms up. Started it Monday afternoon and the rough idle was back. 7L) engines. Had the fuel injectors cleaned two times, (once by chevy service dept), added dry gas to two tanks of gas, changed spark plugs, and wires, cleaned throttle body real good, changed fuel and air filters, checked vacuum lines, sprayed carb cleaner around base of throttle body, intake, vacuum lines, etc. I do have a rebuildable IP core. 3s from 99-05 range. The EGR valve is a circular metal component with a vacuum hose coming off of it. If the engine will not start when the engine is hot, the choke may be stuck in the closed position, typically due to a lack of lubrication. 305 350 400 Small Block Chevy Ultimate Cam Kit. If all other components of the fuel system are working properly and there is still a problem with the idle speed, the screw may be adjusted. They are Chevy and GMCs with what appears to be a 366 ci Big Block and 454 ci Big Blocks. Or maybe IP timing is off. 97 chevy k1500 with 305, engine rebuilt by shop 60k ago, last few months only drove truck 4-5 times, last time driving gave p0306, new plugs, wires, cap, rotor, cleared code, now gives p0300, took intake apart removed sp…. diagnosing intermittent engine idle rpm increase models: 1988-89 buick century and regal 1988-89 chevrolet beretta/corsica, cavalier and celebrity 1988-89 oldsmobile cutlass ciera and supreme 1988-89 pontiac grand prix and 6000 with 2. I think its the IP even though truck runs fine with no lift pump and has no bubbles in return line. I own 2 Chevy Silverado’s and 1 Tahoe. 1991 caprice 305 payed $600 sold 4 $1200 08 3. and did not change the idle rpm's. 7 Vortec with a misfire, P0300 code for 3 months. Sometimes hard to start and emits grey smoke when started. my lb7 has 187k on it and its beginning to smoke white at idle. 7 surging, rough idle,cutting out 02 problem Wicked Spray. In other words, the 5. The engine completely stalled one time as I was braking coming off of a freeway off-ramp into a turn. html Keyword 2 2013 F 150 3 5l Rough Idle. 94 v6 vortec engine specs, vortec 8100 gas mileage, vortec 4300 lt tune up, blowers 350 vortec motor, normal oil pressure chevy vortec engine. A rough idle happens whenever you get a lean misfire due to an overly lean fuel mixture. Oil presure is good. 050": 244/254 Lobe Separation: 112 LC. 87 bayliner 305 chevy Qjet carb ! Runs perfect everywhere but at an idle. 7 tbi runs rough cold and Discussion in It runs fine at or around idle its when you are going down the road and it is not at operating temp that. Post 2113409 - Get all of your tech questions answered on the net's largest community for hot rod and muscle car enthusiasts!. Or maybe IP timing is off. TPI) is warmed up, it seems to idle a bit roughly; kind-of sounds like it's on the verge of stalling sometimes -- but doesn't. Must upgrade valve springs. The idle of a Chevy with Powerglide will forever be part of my aural vocabulary, that high pitched wheeeeeeeee of the pump of the Powerglide and the knock-knock-knock of it having Drive selected, followed by the “clack” of the inevitably broken motor mount…. 1989 Chevy Van 305 stalls: The vehicle fired up but idle a little rough. The idle air control valve for Chevy C1500 controls the air going into the engine. subsequently changed the fuel injection system (standard f504) fuel pressure regulator evap purge valve fuel line o-rings at manifold cap rotor and wires plugs fuel pump. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. It then bogs and backfires 2 Answers. Speed Pro CS187R SBC Hydraulic Camshaft. Browse a bunch of Performance Chevy 350 Rebuild Kit and comparable listings available on sale this week. An idle stop screw is set at the factory and then covered to discourage tampering. 3L is one of the most common engines on the road in America. My 1988 chevy pick-up is running bad,its stalling frequent until it gets warmed up good. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. 27 Nov 2012 But the stable idle won't last long, it'll idle low and rough. I had a mechanic that works for a GM dealership to look at it. 350 TBI/auto Rough idle & hesitating Everything was good until I stopped at a red light and the idle dropped really low and rough, when the light changed I tried to accelerate but had no power, stumbling and hesitating, felt like I was running out of gas but had almost 1/2 tank. The engine misfires or runs rough when it is fully warmed up at constant speed or stopped and really bad when pulling a load up a hill or when power breaking. com FREE DELIVERY possible on eligible purchases. I have really rough idle and very little response at part-throttle. If you retard the timing - the idle drops. It doesn't act like it wants to stall or anything like that and the RPMs stay where they are supposed to be,just the rough idle. The truck has 77000 miles on it, and sat for about 10 years before I bought it. Read the tech article on Choosing the Best Cam, brought to you by the experts at Chevy High Performance Magazine. Then it can be narrowed down to plug, wire or internal. What causes a rough idle? A rough idle can be caused by many different car faults. I have a 1995 Chevy S-10 4. Chevrolet Colorado Suspension Problems. But NO ONE, and this includes the Chevy dealer, could find the problem. Or maybe IP timing is off. I am thinking of 'scoping the idle speed motor wires, but I don't know what to expect. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there?. 3L has had strong results and thus GMC has used it in a lot more than just pickups. With the A/C off and idleing for an extended time the truck develops a cyclical idle. Silverado & Fullsize Pick-ups - 5. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. 480 Lift intake, gears and headers, very rough idle. It's not. ----- Effects of Gasoline Additives On Carburetor and PCV System Performance As They Relate To Exhaust Emissions First Year Report APRAC Project Number CAPE 2-68 Scott Project #2807 Prepared For Coordinating Research Council, Inc. and did not change the idle rpm's. Chevy Silverado and GMC Sierra Stalling Problem My 2000 chevy started this problem 2 days ago. A lot of times the Vehicle Manufacturer will release a Technical Service Bulletins (TSB’s) related to a rough running or Misfire condition specific to your vehicle. Appears a fowled plug or plug(s) on the passenger side was the root-cause. It finally died, and it was the distributor module. i have a 1987 gmc truck witha 305 tbi, stalling alot,especialy when put in gear,replaced many sensors, ecm, etc. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. Lately it has idled low and kind of rough/noisy. Found out GM used 4 and 5 pin modules in the HEI. Open the hood of the vehicle and locate the EGR valve. If the engine will not start when the engine is hot, the choke may be stuck in the closed position, typically due to a lack of lubrication. Engines modified for power at high engine speeds, such as auto racing engines, tend to have very rough idle unless the idle speed is raised significantly. I've seen this out of all of the newer 5. I posted a vid. I put new spark plugs and spark plug wires on, new rotor and cap, new intake, air and fuel filter. Combination street and drag. Other times won't start for 2-3 minutes and then only with the accelerater clear to the floor. 3/4 ton, 350 TBI engine with 125,000 miles. 97 chevy k1500 with 305, engine rebuilt by shop 60k ago, last few months only drove truck 4-5 times, last time driving gave p0306, new plugs, wires, cap, rotor, cleared code, now gives p0300, took intake apart removed sp…. 09-02-11 08:52 AM - Post# 2132906 This all just started happening outta the blue. The J-Body Organization, j-body. When coming to a stop the rpm drops to 500 and feels like it is going to stall. I'm thinking of doing the same thing, new 350 in my 91 Sierra 4x4, considering it has 151,000 plus miles on it, mostly hi-way. A downloadable version of the factory manual is available from this site. This page is dedicated to the owners of these vehicles equipped with GM's dual point fuel injection (model 220 TBI). Sometimes will start again immediately. Normally it depends on what kind of car you are driving, and what temperature outside is.