Question about 2002 GMC Envoy XL
Has a new battery, when i turn heat on or air the rpms drop
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Posted on Jan 02, 2017
The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.
Posted on Nov 20, 2012
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