Work Truck Idle Problem

bolicsa81

Member
Joined
Apr 13, 2011
Location
Salisbury
I recently replaced the TPS and IAC sensor on my 98 c2500 w/ 5.7 vortec

I thought it was idling to high upon start-up

now it idles even higher on start-up and when first put in gear revs up to 1200rpm or so and drives itself unless I mash the brakes all the way down then it works fine?

Any ideas?
Thanks.
 
Sounds like you are getting extra air into intake. Check vacuum lines hoses ,throttle body gasket, and something else I'm not thinking about.
 
Oh yeah did you clean where the iac goes in the throttle body I have to clean mine once a year on my 99 2500 5.7
 
Intake gaskets!
 
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