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#3
01-03-2007, 10:53 PM
Hummer Guru
Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Check engine light
Could be a cat, or:
Bad injector (run a can of Techron through the fuel system. might help, it does a great job of cleaning injectors)
Bad vacuum hose (you can try the old propane trick to see if idle increases when the propane comes near a cracked vacuum line)
Opening past the MAF sensor in the tube to the throttle body
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