What Causes Occasional Misfiring That Returns to Normal After Restarting?

[McHayden]

The following are reasons for occasional misfiring that returns to normal after restarting: Ignition System: Aging of ignition coils and spark plugs can cause the ignition system of the cylinder to fail. When ignition coils develop issues, it most commonly leads to a drop in power and, in severe cases, can cause the engine to stall suddenly. Cylinder Wire Wear: To check if the cylinder wires are functioning properly, simply pull out the distributor wire, plug in a spark plug, start the engine, and observe. Comparing each cylinder will reveal any issues. Fuel Injection System: Clogged fuel injectors or fuel lines can prevent sufficient fuel from reaching the cylinder for combustion, naturally causing the cylinder to malfunction. Excessive Spark Plug Carbon Buildup: Long-term poor combustion leads to carbon deposits accumulating on the spark plug ignition point. When these deposits are wetted by fuel, they create a parallel shunt resistance, resulting in spark plug leakage, weak sparking, or even complete spark plug failure.