Ford Repair Questions? Ask a Mechanic for Answers ASAP
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The coils are difficult to diagnois because they really cannot be tested unless they are not woorking at all or tested with special equitment to check the spark voltage outpupt. I have personally seen a lot of coils go bad so I believe that may be your problem. If you have a cylinder misfire code, you can first try swapping fuel injectors too see if the misfire changes cylindters to at least rule out that.