it seams I keep burning up coils, don't know why... I'm running a pertronix distributor, with the right coil....I'm currently not running the ballast (burned em up with or without it). The symptom I'm getting is I'm getting bad spark, especially at higher rpms. as soon as I put a new coil in...runs perfect, for about a month or so.... anyone have a problem with this... I'm a good wrench, but don't know my electronics well...