I have a 2000 ficht 175 that has a miss to it, when i turn out the lights in the shop the the portion of porcelain that shows between the base of the plug and the boot of the wire has blue spark completely around it and and at the coil it is jumping spark out there also, i changed out the spark plug wire, the plug and the coil, still doing it. i took the wire off at the plug and it still jump at the coil, the plate that the coils mount to is very rusty would this be causing it. any ideas would help, thanks!