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Contributor
12 Answers
- Posted on Feb 01, 2011
Re: 2002 GMC SIERRA, 4WD, 5.3L. A COUPLE WEEKS AGO,IT...
Find the mass air flow sensor and unplug it and see if that helps any you can do the same thing with the temp sensor and map sonsor one at a time I have seen these not give a code and be bad check the spark plugs and see if they look good
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