When I was running a can coil with no ballast I noticed it would lose spark if I left the ignition on too long without the engine running. I always assumed this was from the coil overheating - if the points happen to be closed when the engine stops and the key is left on the coil sees more current than if the points were opening and closing. Or is it the other way around?
If the ballast/coil mismatch is bad enough this can happen even as the engine is running - I had a VW years ago that was rewired without anyone noticing that there was supposed to be a resistance wire in the harness, and would start to run funny after an hour or so.
Too many amps will usually kill a square coil pretty quickly, but some coils tolerate it better than others, and bounce back after being allowed to cool. Though it is likely that in the long run some damage is being done.
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