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1987 Chevy Suburban Idling Issue

Tiny
PASCUA
  • MEMBER
  • 1987 CHEVROLET SUBURBAN
Engine Performance problem
1987 Chevy Suburban V8 Four Wheel Drive Automatic 150k miles

My 1987 Suburban will not maintain a steady idle and a miss at idle. It idles up and down, but when driving it runs great. I suspected a vacuum leak, checked and no leak found, replaced air intake valve, map sensor, spark plugs and wires, egr valve, changed throttle body and gasket.
Any help would be greatly apperciated.
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Wednesday, September 29th, 2010 AT 7:13 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
They had a lot of problems with the throttle bodies on those with leakage in the base, sometimes from the EGR and sometimes vacuum.
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Wednesday, September 29th, 2010 AT 7:16 AM
Tiny
REDWHITE
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  • 4 POSTS
Same problems with mine. No vacuum leaks, acts as if it would flood itself out. I also change the map sensor with no change need help
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Saturday, October 16th, 2010 AT 10:25 AM
Tiny
WRENCHTECH
  • MECHANIC
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Please start a new question of your own. We can't follow 2 vehicles in the same thread.
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Saturday, October 16th, 2010 AT 10:38 AM

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