Posted on 8/28/2026
An engine misfire happens when one or more cylinders fail to produce normal combustion. Sometimes the problem is easy to notice because the engine shakes, hesitates, or loses power. Other times, the only clue is a check engine light or a slight stumble under acceleration. What makes misfires tricky is that several different systems can cause them. Spark plugs, ignition coils, fuel injectors, vacuum leaks, compression problems, wiring faults, and even incorrect valve timing can all lead to similar symptoms. A good repair process is less about replacing common parts and more about testing the cylinder that is actually having trouble. What a Misfire Feels Like A mild misfire may feel like an occasional hesitation or uneven idle. A more severe one can make the whole vehicle shake, reduce acceleration, or cause the engine to sound rough. Some misfires appear only when the engine is cold, while others show up under load, during highway acceleration, or after the engine ha ... read more