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Discussion Starter · #1 ·
2003 Silverado 4.8


When cold it is idling at about 800-900rpm as it should.

Once it warms up it drops down to 400-500rpm anytime you are stopped.

If in gear it want's to die.

The check engine light is not on.

Any idea's what is causing this ????????????


TIA
 

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How many miles on her? Have you tried all of the simple stuff like check the fuel filter, air filter, etc? You may have some carbon build-up, I'd try something like a good fuel system cleaner too. That's all step-1 and lets you start to rule stuff out.

After that, I would take a look at the throttle body and check for gunk and clean it out. You can do that whole job in an hour for $15 or less.
 
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