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What causes problems starting a car and the engine to misfire going over 60 mph?

This problem started about two months ago. I have a 2006 Ford Taurus. So far no mechanic can figure out the problem. They have replaced all of the spark plugs (numerous times because they keep going bad), an engine coil, the crankshaft position sensor, the battery, did a tune-up, ran a $100 diagnostic test and still the problem occurs. Anyone have any idea what could be the problem?

Update:

I forgot that they also did a coolant flush.

4 Answers

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  • 7 years ago
    Favorite Answer

    Sounds like either engine timing, which is electronically adjusted , poss fuel filter clogging up or tune-up time.... or both.

    Source(s): 26 yrs over the road diesels & medium duty GM dealership technician.
  • 7 years ago

    What did the $100 diagnostic test say?

    What is happening to the spark plugs? They should last a long long time.

  • mike
    Lv 5
    7 years ago

    I would say a 2006 Ford Taurus if I were guessing.

  • Anonymous
    7 years ago

    The fuel injectors can be dirty

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