With a Ford it is difficult to tell which coil is defective. On a GM, you can locate a cylinder misfire. It was my only way to fix the misfire for a good price. Brand spirals cost 50 pieces plus boots for some reason are sold separately. I was able to replace them all without removing the fuel rail as suggested, reducing my repair bill from $1200 with the original spark plugs and those coils to $150. No complaints yet!
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