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Originally Posted by atv087
this is why ford gives you a certain type of plug to use with that engine its specifically designed to be used for optimal engine life and preformance adding the platnum plugs wont do anything but harm your engine because it isnt made for it..
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There is nothing wrong with running platinum plugs in these cars; they will work just fine.
But you do need to change ALL the plugs and get rid of those Bosch plugs you put in. You need to put in 6 new Motorcrafts or Autolites. Come back if you still have problems.