1990 Chevy Truck Engine misses at idle, sporatic

1990 CHEVROLET TRUCK
25,000 MILES • V8 • 2WD • AUTOMATIC
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GLASSMASTER
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  • 3 POSTS
It's erratic. Misses at idle. Also a little hesitation at first acceleration. Sometimes when its first started, when I put it in gear, it will shut off. No code shows. I'e changed out: spark plugs, O2 sensor, TPS, PCV valve, Idle air control valve, fuel filter, changed out 1/4m inch vacuum hose, EGR valve checked, not sticking. I'm stuck. Thanks
Aug 27, 2010 at 11:02 AM
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RASMATAZ
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  • 75,992 POSTS
Check the engine compression if okay-check and test the MAP sensor and also the fuel pressure-You sure its not bad fuel?
Aug 27, 2010 at 11:17 AM
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GLASSMASTER
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Disappointed. None of your suggestions helped. I replaced distributor and wires and cleaned coil. The hesitation is gone. You didn't even mention that in your suggestions. Next time I wont donate for a reply, I'll just wait till you get around to answering.
Aug 29, 2010 at 1:17 AM
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RASMATAZ
  • ✓Experienced Mechanic
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I gave you something to work with I'm not done with you. Do you have a check engine light? Also check the fuel pressure with a fuel pressure tester and give me the readings I need to know this and Clean out the EGR/PCV valves and look for vacuum leaks then report back with your results
Aug 29, 2010 at 9:57 AM
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GLASSMASTER
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That's ok. Everything mentioned was cleaned/changed out. The new distributor and plug wires did the trick. Truck runs fine. Thanks
Aug 30, 2010 at 3:14 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Your welcome and thanks for coming back with the fix this way others will benefit from it-
Aug 30, 2010 at 10:49 AM
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