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The coil wire may be breaking down with heat, but so could the coil. I've seen coils arc from bad coil wires - even though the coil was good. The wire could be gaining resistance with heat - and the joules have to go somewhere - kinda like lightning if there's no easy path to ground.

Frank


OK I tried a little test and started to slowly pull the coil wire out as it was running and the ARCH got real big, and started to change color the further the boot came back from the base... Does that tell you anything?

John Pszenyczniak
67 Mustang Coupe
95 Firebird Formula
05 Ram hemi 4x4
91 Montero RS LWB w/ 320k miles before rebuild, 900 down and its still kicking!!!