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Reply To: 04 gmc envoy 5.3l

Jeff Moore
Jeff Moore

No codes for 02 sensors the maf seems to have no affect on it plugged or unplugged. I sprayed the intake with break cleaner looking for leaks none to be found. The intake gaskets never been changed. It just seems weird that when it starts to run rough you just cut it off and start it right back up and it runs fine and smooth but not long.