engine revs up and down on its own while in park

1995 GMC JIMMY
14,600 MILES
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SPOKSTER69
  • MEMBER
  • 2 POSTS
HELP! i have and idling issue with a 95 gmc jimmy 4.3 liter v 6 2wd vortec not all the time mostly when the engines hot!Today errtacic engine idle rpm up and down until engine turned off. what should i do first? replace EGR,IAC?
Jan 30, 2012 at 6:25 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
nope try choke cleaner on teh throttle plate and iac valve. then drive it and see if it does the same. then check fuel pressure and for vacuum leaks.
Jan 30, 2012 at 8:39 PM
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SPOKSTER69
  • MEMBER
  • 2 POSTS
thanks for your input worked out well.
Jan 30, 2012 at 8:59 PM
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