Hot restart issues.

B3422w5 said

I have seen 12.2 volts make an MSD box not happy to the point the car wouldn’t start

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Crank, maybe not fire. If it struggles to crank, likely has something happening with ignition in the chamber.

Funny that the guy saying this stuff also says that MSD aren't sensitive to voltage. I'm out.

Simple diagnosis stuff, pull coil wire, try it, add a jumper try it. Hillbilly stuff to narrow the issue without any conclusions.