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1999 Yukon misfire please help!


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Ok so I've got a 99 Yukon with the 5.7 and it's throwing the dreaded P0300 code along with a idle air control code. I know it needs a new iac valve but would that cause it to misfire? It only seems to misfire when it's not at full throttle and only under 3k rpm. The cap rotor plugs and wires are new within the last 1,000 miles. Could it be a leaky intake gasket? They've never been done

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