I wont lie even if it is the coil, I guess over heating, in the summer or really hot temperatures and at completely different circumstances causing my car to just die, I won't be able to tell the coil is the cause unless I test it in the heat driving around waiting for my car to die (which if I get the coil replaced it never dies). all in all I won't be able to tell for a long time lol. Remember the interval between my car dying often enough, then not dying, then dying on me recently was three years.