@garymcauley7630 I'd do both at the same time. Arcing from the coil insulation can damage the spark plug and visa versa. The fact that the energy is finding a path through the coil insulation could mean that the spark plug contact has high resistance.
You have a miss and you know one of the coils is arching. Should you not fix that before changing plugs?
@garymcauley7630 I'd do both at the same time. Arcing from the coil insulation can damage the spark plug and visa versa. The fact that the energy is finding a path through the coil insulation could mean that the spark plug contact has high resistance.