99 GMC misfires when at running temp

1999 GMC
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HOLLINGSHEDLR
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I have a 99 GMC Seirra and the engine starts to misfire when it is warmed up and i am drivin but runs good when it is cool. what is the problem
Feb 20, 2007 at 6:51 PM
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CHEVY22
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hi
is the engine light on ??? lets start there
Feb 21, 2007 at 6:43 AM