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you probally have a bad plug. or as in my case, it ended up being one of the coil packs. that's those two boxes that the wires come out of and go to the plugs. A whole lot easier to change than the plugs. I think they are $55 each. Dealer wants $500 to do plugs wires and coil!!

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12y ago
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Q: What would cause a 1998 ford expedition to idle and run rough?
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