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1999 GMC Yukon Question: Engine "lopes" or lurches at idle and at 40mph



Reagan, Gasoline, Vancouver, WA, January 11, 2010, 18:06

5.7l Vortec. 200k miles. New fuel injectors. Will changing CMP sensor solve this problem?...perhaps? Getting terrible mileage for 4wd XLT Yukon. Any suggestions on getting better out of this engine?

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  • Answer #1

    January 12, 2010, 17:04

    How about a tune up ( distributor cap and rotor spark plug wires and spark plugs )

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    Reagan, January 13, 2010, 02:59

    Just did full tune up. New wires plus distb & rotor get code P1345 so pretty sure it is sensor...trying to see what the field thinks. TY

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