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1) bad connections: make sure the 12V electrical connections to the coil are tight. If all of the spark plugs are showing the same effect then the HV wire from the coil to the distributor may be loose or have gone bad. If only one spark plug looked bad, then it could be the wire to that particular plug. This could be the cause of the spark you saw in the engine compartment. Do you have the tool for plugging the wires to the spark plugs? If makes it much easier to make sure the connections are good. One loose wire to one plug can cause really nasty misfiring and other problems, which brings up #2.
2) Distributor cap: This is one of the weakest links in the system, especially if you have electronic ignition. The cap really is not made for these kind of voltages. So if there is a loose connection to one of the plugs, the spark can jump other places, often damaging the cap in the process. I have gone through a huge number of these over the years. So check if for any cracks or discoloration. Better yet, replace it and the rotor. They're relative cheap. Keep a spare around as well.
Since you saw a spark in the engine compartment, the coil was good at that time, so should be OK. They don't go bad very often or easily. If you want to have a spare around to double check it, just get an ordinary inexpensive one, no need for anything expensive. It should run OK regardless.
Do you still have mechanical points? These go bad easily. Switching to a Pertronix 2 would be worth your while.
Hope this is of some help.
Tom
Last edited on 10-20-2018 05:06 am by Tom Bradley