» » »

GMC Q&A

Ask Your Question

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

 

Question

Reagan, Gasoline, Vancouver, WA, January 11, 2010, 15:06
 Rookie

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?

1 Answer
Flag This
  • Answer #1

    January 12, 2010, 14:04
     Master

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

    Flag This
  • Reply

    Reagan, January 12, 2010, 23:59
     Rookie

    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

    Reply
    Flag This