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Published on Feb 18, 2012
How to diagnose a bad ignition coil on plug that's causing a misfire. There can be many different causes of misfires, such as ecm, injectors, low fuel pressure, vaccum leaks, etc. The coils are a good place to start with, they're easy to swap and they lead you to the cylinder that is misfiring. If after you swap the coils and the misfire stays at the same cylinder, then you need to look at the other possible causes.