first, does the motor have 2 or 3 coils? if so, check the ohms on the ones you know is good, then check the ohms on the other one. if they're about the same, they might be fine. other than that theres the ignition module usually located under the coil packs. i dont know how to check it, but if you think its bad, contact your local trusted mechanic and see if he knows how to check it. modules usually run about 70-100 dollars, depending on the manufacturer. you could also check the crankshaft position sensor, but usually if that goes, the whole engine will misfire.
also, the ingition system has what you call a "dead spark." for example, you have 3 coils on the car, and two cylinders are fired by 1 coil. while one cylinder is on its compression stroke, the other is on its exhaust stroke, and when it fires it sends the spark to both cylinders at once. thats why the spark going to the one on its exhaust stroke is the dead spark.
hope this helps!!!
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