I used the Autolite XP-104 but recently installed Autolite APP764.
It seems to have started when I smeared some conductging goop on the boots of the wires.
I have testged the Coil Primary som far but need to test the secondary's also.
I had a problem with my old coil and bought a used one on ebay.
I would feel better with a new one.
The new wires only have maybe 4,000 miles on them.
Gary