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bad idle

  1. 2000 expoloer bad idle.

    Ford Explorer, Mercury Mountaineer,Lincoln Aviator
    I have bad idle on my truck. It comes and goes and sometimes I can't get it much past 40mph but other days it runs like a champ???? I have replaced the idle air, mass air, pcv, air filter, fuel filter, new plugs and wires. Oil pump maybe?