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Engine revs up and down on its own while in park

Tiny
SPOKSTER69
  • MEMBER
  • 1995 GMC JIMMY
  • 14,600 MILES
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?
Monday, January 30th, 2012 AT 6:25 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Monday, January 30th, 2012 AT 8:39 PM
Tiny
SPOKSTER69
  • MEMBER
  • 2 POSTS
Thanks for your input worked out well.
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Monday, January 30th, 2012 AT 8:59 PM

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