Question about 1990 Chevrolet C1500

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I have a 1988 chevy k2500 4x4 350 throttle body f.i. once the motor gets good and warmed up it starts sputtering and back firing and loses all power it only does this in gear not in neutral or park?

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Check the dist. cap and the rotor to make sure they are not carbon up and for cracks in the cap, also check the control module in the dist. Parts store can test it for you. In addition, check the coil to see if it is weak and test the pickup coil in the dist. You might want to change the etc by the thermostat housing, they can make a truck do strange things as they control the ecm signal, also if it has on check the crank sensor it maybe sending an intermittent signal to the ecm. .

Posted on Jun 03, 2015

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I would take it to a good mechanic and have him check to see if it needs a tune up or if it has jumpt time. Sometimes the timming chain will stretch if the engene has a lot of miles on it.

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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1 Answer

1994 Chevy Camaro, 6 Cylinder, stalling problem


Try cleaning the throttle body and the idle speed control valve, they get full of sludge and this causes stalling. Use a product called CRC Throttle valve cleaner on both parts, DO NOT USE CARB CLEANER IT WILL RUIN THE PARTS.

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1988 chevy S10 turns over but won't start getting spark put in new fuel pump,cpu and injector. If I pour A little gas in throttle body hole it will fire for a few sec. fueses all test good.


Hello, just had this problem myself. Check your EGR valve by pulling the vacume line off and pushing up under the valve put your finger over the vacume line hole and release the valve, if it returns to normal position then its bad if not its good. If its bad it needs replaced. Mine did the exact same thing and thats what it was. Hope this helps

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2005 chevy trailblazer, rough start, stalls, gas smell, warms up idles fast, once it warms up ok. Acts like it is going to die. Sputters. Changed air filter. Changed sparked plugs, changed oil. Did...


With temperature related problems, check your intake manifold bolts for tightness. Our intakes are plastic and have a tendency to become loose, causing vacuum leaks. When it warms up, the plastic intake will expand sealing any leaks. But when it's cold, will contract, causing leaks. Easiest to check are cylinder #5 & 6 near the fire wall.

Also, clean your throttle body, a dirty throttle body will cause idle problems, especially in TB's because we don't have a true PCV valve, so gets dirty which causes sticking of the butterfly.

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EATHER IS NOT GOOD , ITS FOR COLD COLD MOTORS.. CHECK YOUR FUEL PRESSURE AND GAS FILTER .YOU MIGHT HAVE A BAD FUEL PUMP ITS IN THE GAS TANK!!! . USE CARB & CHOKE CLEANER ..PARTS MASTER # 1736 ..ITS NOT AS HOT AND WONT POP A HEAD GASKET .IF'N I WAS ANY HELP AT ALL PLEASE VOTE.. JAY

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Chevy 1988 truck 5.0 My truck will start and run, but once it is warmed up and you put it in drive or reverse it dies, it will not stay running. If you put it in neutral or park it idles fine. If you put...


idl air control (IAC),may be bad,also,check the EGR valve,and all vacuum lines going and coming from the throttle body. yu can test the EGR,just try pushing the diaphram by hand from beneath. if you can move it easily its good,if its hard,or doesnt move,ot needs repaced. also a pcv valve and air filter are good ideas,considering you have replaced 80% of the emission system already.

May 01, 2010 | 1988 Chevrolet C1500

2 Answers

1990 Chevy Scottsdale 1500 wont idle when first starting cold


ICM idle control module, loc throttle body, it may be dirty, remove clean or replace, its easy..

Jul 29, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Chevy S10 Pick 1995 - Sputters and almost stalls when accelerating.


You could have a dirty EGR valve, you can re move it from the manifold and clean it with Throttle body cleaner. Might as well buy two cans, since your cleaning the EGR, might as well clean out the throttle body too.
Spray the throttle body cleaner in to the throttle body with the engine running and try to keep it at 1000 rpm and then to 1500 rpm as you clean out the throttle body and let it idle down for 2 min then turn the engine off. Then turn the engine to the run position for 10 seconds and start and let idle, ro for a test drive and hope that solved the problem, if not there a few more things we can do which will consist for tune up.
Note: Clean the EGR first so you don't burn your self since the engine would still be cool before you clean the Throttle body.
Good luck and keep me posted.

Jun 01, 2009 | 1995 Chevrolet S-10 CA Edition

1 Answer

MY 89' CHEVY WITH 305 IS BACK FIRING THROUGH THE THROTTLE BODY


Chk. your egr valve, that it is not sticking and you got vacume to it. could be carboned up and is not working.

Feb 13, 2009 | 1989 Chevrolet C/K 3500

3 Answers

88 Nissan z24i backfires through throttle body and loses power when in gear


Check your intake and exhaust modules. I have a 1987 D21 and had the same problem (if I understand your post). I replaced the modules located behind the driver side headlights and it fixed the problem. Good luck! I hope this helps.

Nov 04, 2008 | 1987 Nissan Pickup

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