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2002 Cadillac DeVille Question: rough idle



derek1060, Ridgewood, NY, January 09, 2010, 12:12

4.6 noth star i change the plugs and wires crank sensors fuel filter code PO300 mutiple mis fire what else could this be

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  • Medium-star Best Answer
    January 09, 2010, 12:17

    Here is a ton of great information about the P0300 code: http://repairpal.com/OBD-Code-P0300

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  • Answer #2

    Visitor, June 16, 2010, 23:56

    Try the Vacuum Hose's or Brake Booster.

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