Mechanics

GMC SIERRA RPM PROBLEM

2003 GMC Sierra • 250,000 miles

On cold start truck RPM is good but then drops to the point thst it stalls worst in cold weather
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Guest
December 10, 2012.



Check for vacuum leaks and check the idle air control solenoid (IAC)

It sounds like the idle control motor is not working. Have it tested to confirm.

Roy
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ASEMaster6371
Dec 10, 2012.

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