Question about 2003 GMC Sierra
Reinstall your clean equipment and look into fuel additives to thoroughly clean your engine of all the carbon, hopoe this helps.
Posted on Sep 09, 2013
Find the egr valve and with the engine running, disconnect the vacuum line attached to it. If the engine runs better then the egr valve is stuck open. Replace the egr valve. It is held in by 2 bolts and usually located at the front of the intake manifold. Usually dull gold in color and shaped like a mushroom.
Posted on Apr 27, 2010
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Posted on Jan 02, 2017
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