Silverado, Sierra & Fullsize Pick-ups The Silverado & Sierra have been two of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

fast idle

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Old Apr 7, 2014 | 2:54 PM
  #1  
flh69's Avatar
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Default fast idle

1990 K2500, 350TBI
I noticed lately that when I first start the truck when the engine is cold it idles a lot faster than it use to. Also after it warms up it is slower to come down to idle when I leave off the throttle. Any ideas would be appreciated.
Thanks
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Old Apr 7, 2014 | 2:58 PM
  #2  
Allan In NE's Avatar
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Vacuum leak; probably at the TBI base gasket.

Allan
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