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On cold start truck RPM is good but then drops.

Tiny
ANONYMOUS
  • MEMBER
  • 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
Monday, December 10th, 2012 AT 2:42 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It sounds like the idle control motor is not working. Have it tested to confirm.

Roy
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Monday, December 10th, 2012 AT 3:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Check for vacuum leaks and check the idle air control solenoid (IAC)
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Monday, December 10th, 2012 AT 3:05 AM

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