Coil ignition system as in coil-on-plug with individual coils?

Anyway, part throttle misfiring usually ends up being worn out plugs (that is if the engine seems to perform OK at idle). I've lost count of how many vehicles I have gotten that were written up as a slipping transmission only to test drive and find a part throttle misfire that is cured by a set of spark plugs. Sometimes the plugs just don't make it to the 100K mile service interval.

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Erich Loepke
2010 Ford Focus
Currently Benz-less