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1992 Chevy Astro Why

Tiny
HARLEYMAN1075
  • MEMBER
  • 1992 CHEVROLET ASTRO
Engine Performance problem
1992 Chevy Astro V8 Two Wheel Drive Automatic

I have a 1992 Chevy Asto that has a 350 TBI motor in it. When it idles it idles up and down (irrationally idles). Also when driving it wants to fall on its face. I have checked vacuum lines, fuel pump, and the timing. What else could be wrong?
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Friday, July 9th, 2010 AT 12:17 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Since the 350 isn't factory, it could be a thousand things. Was the computer replaced when the engine was? Have you checked things like the throttle position sensor? Has a check engine light come on?
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Saturday, July 10th, 2010 AT 10:01 PM
Tiny
HARLEYMAN1075
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The computer was changed when we put the motor in. The trottle position sensor is new. And my check engine light is not on. I checked the injectors, fuel regulator, and vaccuum lines. This is a new problem. It just started doing it. The motor has been in the van for a year now. We put it in the van in 2009.
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Monday, July 12th, 2010 AT 10:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
The only things I can think of are the TPS, IAC, or even the EGR valve. If there are no vacuum leaks, it has to be one of the things I mentioned.
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Friday, July 16th, 2010 AT 10:56 PM

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