ENGINE REVS UP AND DOWN ON ITS OWN WHILE IN PARK

1995 GMC Jimmy

Tiny

spokster69

January, 30, 2012 AT 6:25 PM

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?

2 Answers

Tiny

hmac300

January, 30, 2012 AT 8:39 PM

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.

Tiny

spokster69

January, 30, 2012 AT 8:59 PM

Thanks for your input worked out well.

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