Part of the 4.6 and 5.4 build and update that everyone seems to have forgotten. If the coils don't charge, the spark plugs won't charge, and no matter how good the coils you use, they're useless unless you replace the frayed wires. I would suggest constant heat under the hood at least after 100,000 miles (50 more of it). You must be able to work with cables and use common sense.
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