Question about 2001 Chevrolet S-10

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I have a 2001 Chevy s-10 2.2L, truck runs like it is misfiring after it rains or when high humidity. After it gets driven for a few minutes will run just fine, runs good on non humid or rainy days. Changed coil pack, plugs and wire and problem still exists.

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Well its not missing because of your ignition. So ya gotta find the vacuum leak . First scann ECU for codes.

Conduct an injector balance test ( or have a shop do it ) to determine whether all injectors are firing and how much fuel they are firing.
Next do a cylinder leakage test to determine which cylinder has a vacuum leak.
Lastly conduct a visual inspection of the air intake port as well as the Mass air flow sensor. Clean and test Mass Air Flow sensor by the book. Most of the time this sensor leaves a code. Good luck

Posted on Aug 20, 2010

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Replace your dist. cap.

Posted on Aug 03, 2010

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Lynda, If it is the 4.3 V6, they are prone to getting moisture in distributor which causes the symptoms you are talking about including the poof. You can have scanned to see if trouble codes are stored, you may get multiple misfire.
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