Question about 2005 Chevrolet Colorado

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2005 Colorado RPM's flucuate from normal RPM down to 500 rpm usually after I first start the truck. Then after running for 10-15 minutes this issue goes away. The truck starts fine. This problem only occurs on a cold start up and after I drive to a point I have to stop and push in on the clutch, the problem appears. It will flucuate about 3x and then goes to the normal RPM setting and will not do it again, until the truck is started again from a cold start.

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Could be the IAC(Idle air control valve). It could also be related to the IAT(Intake Air Temperature) sensor. The IAC should be in the throttle body and the IAT in the intake manifold.

Posted on Dec 28, 2010

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My 2005 Colorado RPM's fluctuate on a cold start up, from normal down to 500 Rpm. The truck starts fine, but as soon as I have to push the clutch in and stop, the Rpms will fluctuate about 3x and then it...


eddyblueange_2.jpgthis is an idle valve after 1996 the ecu control the idleing from the engine with this air by pass if this valve is geting bad it can get stuck open or closed or dont working right is an electric selenoid ......... listen for air leaks ....... wen you push the clutch you push the brake too check the brake booster

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