5.0's 4 ever said:Could be a lot of things, a bad spark plug, valve cover leaking oil down in the spark plug hole, or a bad spark plug wire.
With a 100K miles on the car it is due for tune-up, I would replace the spark plugs and wires, also check to see if the valve cover gaskets are leaking.
5.0's 4 ever said:Pretty much up to opinion, motorcraft, NGK, autolite are all good plugs.
Spark plugs would be the cheapest and easiest thing to replace first, but I would not be suprised if its a bad wire.
Change em...go with 9mm wires if you can find them local.03gtmustang said:I think the spark plugs were replaced 15-20k miles ago, but the wires have never been replaced.
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