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bmechanic83

Dec 30, 2011 11:14 AM

Persistent High Idle

Hi everyone. A friend of mine has a 96 Yukon with a 350 vortec in it. the problem is is that it idles to high. usually around 1000rpm instead of 600 or 700. Ive tried another IAC motor but that didnt do much. Do you think it could be the throttle body? it seems to run good otherwise good power and stuff. Any help would be appreciated.thnx

LS1TRUCKGUY

Dec 30, 2011 12:26 PM

Could be a throttle body issue or a vacuum leak

bmechanic83

Jan 23, 2012 06:38 PM

Hi. just thot I would let u know what I found out. It turned out to be the intake gasket was collapsed between cylinders 3+5 so vacuum was getting into the crankcase. I had never seen this before. So I changed gaskets and now it runs way better!!! thanks!

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