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is the spark coming out of the wire boot itself or from the coil tower the plug wire connects too ?
try to look really good at it
most of the time a new coil and coil wire will fix it right up
the coils will get a hair line crack on them
but if you have a bad coil wire with high resistance the spark will jump out from the boot
it seems to be coming from the area were the boot butts up against the coil.