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Which brand and part number spark plug did you use.
It's a misfire under load. If you didn't have one before, this problem is most likely due to a bad connection (plug wire, COP, injector, etc). If it was there before, it's most likely a wire or COP.
I am having the same issue with my expedition. So it is a COP, or wire, how can I determine what one it is? Each COP is over $40 a piece so I don't want to change them all out if I don't have to.
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