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1991 Chevy Truck EGR valve? Idle air valve?

Tiny
SERX22
  • MEMBER
  • 1991 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 278,268 MILES
Well my problem is that my truck was running fine then yesterday morning I went to start it up and it will not run right. The rpm's will just go from nearly stalling back up to 1500. It will continue to do this even when I put it in to gear. It will hardly respond to gas unless it is in park. If I rev the engine up to 2000+ rpms it will go back to idle but on stay there for roughly 10 seconds. I checked the fuel line, fuel fitler, fuel pressure, replaced the ignition coil, and checked the ignition module. Now, I am stumped as to what to do. Please help.

Thanks
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Sunday, August 16th, 2009 AT 12:40 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,858 POSTS
Has the check engine light come on?
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Monday, August 17th, 2009 AT 11:46 PM
Tiny
SERX22
  • MEMBER
  • 4 POSTS
No. I did try a new egr valve and a new idle air valve and neither one worked.
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Tuesday, August 18th, 2009 AT 1:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,858 POSTS
This is a tough one. Have you checked to make sure the catylatict converter isn't plugged or in the process of plugging?
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Tuesday, August 18th, 2009 AT 10:30 PM
Tiny
SERX22
  • MEMBER
  • 4 POSTS
No. Not yet. I was told to check the vacuum hoses first. I checked but I might have a small leak. I will check the cat. Converter next and post what I find out.

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Tuesday, August 18th, 2009 AT 11:29 PM

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