Mechanics

ENGINE REVS UP AND DOWN ON ITS OWN WHILE IN PARK

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?
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Spokster69
January 30, 2012.




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.

Hmac300
Jan 30, 2012.
Thanks for your input worked out well.
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Tiny
Spokster69
Jan 30, 2012.

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