2002 GMC C2500 does not idel correct when cold

2002 GMC C2500
15,000 MILES • V8 • 2WD • AUTOMATIC
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1MORE4ME
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  • 1 POST
When The temperature is below 40 degrees my truck will not idel . It whnts to ruv up and down sometimes it shuts off and I have to restart. It tend to get worse as the temperature gets colder . It start and runs great when the temperature is warm .
Already changed plugs and wires and fuel filter .

What would cause this ?
Jan 20, 2010 at 12:40 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Do you have a check engine light On, Last tune-up??

Get a repair manual find the idle air control valve and EGR valve clean it out and see what happens
Jan 20, 2010 at 1:13 PM
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