symptoms of a bad ignition module
You should be able to diagnose a faulty ignition coil before having to replace it. Symptoms of a Faulty Ignition Coil. One of the most common symptoms of a faulty ignition coil is when the vehicle runs for a while and then the car's engine suddenly dies for no apparent reason. This occurs after the ignition coil or module gets too hot, and usually will correct itself after the engine module cools.