Q&A

 Master

Just because you have a P0300 does NOT mean that you have bad Ignition Module by any means. You first must check your fuel trim. A lean condition will commonly set a P0300. You could have a vacuum leak, or a worn Mass Air Flow Sensor etc, etc. Even bad wires and plugs will set a P0300, so the moral of the story is to keep inspecting, a P0300 only means that there is a random, multiple misfire, that is all that it means.