• Apr 8, 2026 Engine Misfire Or Rough Running Coil Ontsb 04 16 1 Plug he first cylinder This code suggests a problem with the ignition system including the ignition coil spark plug or related wiring Common Causes of Engine Misfire Faulty Ignition Coil This is a common cause as coils can degrade over time or be damaged due to excessive heat or ele BY Greg Howell