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Re: '98 Expedition spark plugs
True about the coil and plugs blowing out. I've learned to change the coil and the plug in the event of failure, since coils often fail due to a misfiring plug and the plug fouls due to a faulty coil. Use dielectric grease on the plug boots. 5.4L engines have always been coil on plug, but the 4.6L had wires until 1999. I could be wrong on the changeover year, though.
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