I had the same problem after I put in the Petronics but doubt that caused it
The coil got so hot you couldn't touch it for long
I put in one of those fancy ones from the same guy that sold the Petronics unit
When I replaced the old one, I put it in with the wires at the top rather than the bottom as stock on the Amphicars-----at one time I ran across an email on a Spitfire site, that all coils should be horizontal or vertical with the terminals on top as the coil is filled with liquid to keep it cool.
Now it still gets a little hot, but you can keep your hand on it
Of course, it depends on wether yours is - or + ground as to which way the wires go---if it is wrong your coil will get really hot before it goes bad completely.
good luck
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