this will probably make me look like an idiot, but a quick answer is worth it...what are the "coils" on the Kohler engine in a hustler super z? One member wrote these detiorate from heat over time and will go out eventually...is the coil that person's referring to the small, black module that the spark plug wire leads to?? If so, I know that's my problem, but would like a confirmation from someone who obviously knows more than me. I've searched the parts list on the hustler manual, but cant seem to locate that item or what a coil is either. THANKS!