1999 Chevy Silverado idles high and low

1999 CHEVROLET SILVERADO
126,300 MILES • V8 • 4WD • AUTOMATIC
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FREESTYLEXXX02
  • MEMBER
  • 1 POST
if anyone could help me it would be greatlly appreciated.....
whenever the weather is colder my truck will idle high and low and surge.... if i unplug the mass air flow sensor it will quit doing this but makes my truck shift harder. ive changed the mass air flow sensor, fuel pressure regulater and still seems to idle really high and low. an engine scaner says bank 1 and 2 are running lean... please help! if anyone needs more information i will get it to you!

thanks cody
Jan 10, 2008 at 11:54 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
sounds to me like you should clean out your throttle body and chagne your ocolant temperature sensor.
Jan 10, 2008 at 12:36 PM
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