I have Honda Jazz 2007, 200k KM mileage. My car ignition coil last maximum 6 months and after that it requires replacement. Whenever it happens, my car misfires only while driving. There are no any symptoms like rough idle, decrease in car power, poor fuel economy, difficulty starting the engine, check engine light, exhaust backfiring. Only car misfires while acceleration in driving. Even OBD device doesn’t show any error. I’ve replaced new plugs but still facing same issue. Whenever this happens, mechanic suggests me to change the whole coil pack because mechanic unable to find which coil is bad. The only way for mechanic to find out, when car misfires on idle position. And this only happens when I don’t replace the coil and use my car for long time with bad coil (which is not practical). Please guide how can I fix this issue or at least a way to find out which coil is bad.