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I had a 150K service and all the plugs were changed. The leads were tested. They (subaru service) even plugged the computer in and it showed no faults. If I swap leads around won't that stuff the timing? Sorry, I'm not a mechanic as mentioned before so excuse my ignorance...wanting to learn. If ther...

Hi...New here and need urgent help. I'm not sure how to diagnose the real issue. I'm no mechanic for starters... I think the ignition coil is not working for cylinder 4. I remove the spark plug leads from the ignition coil one by one and they all have arcing and the engine sputters...all except for ...