Po302 code also po316 code
Put the old coil back in #2 & walk the new one to another cylinder
PO Codes are wrong, as many times as correct on a ford
Forget the 316
Your best to look at fuel trim with a professional scan tool
& cylinder misfire counts in Mode #06 also
Those trucks have leaking injectors some times, but that isn't
the code your getting
Spark plugs can't be in there over 3 years
The front 2 oxygen sensors have to be replaced at 100,000 miles
Do those 2 items & then diagnose the misfire or walk the coils
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