I'm fighting a similar prob on my '91 TBI kota. Won't start when warmed up.
Tried coil and PCM. Def ignition because starting fluid doesn't do a thing.
Fuel pump was replaced several years ago. I'll recheck the wiring and try the pickup coil next. Runs perfect when cold, but will eventually die if left running after warmed up, until whatever is failing cools completely off.
Very annoying, to say the least.
Just to add, the coil gets "normal warm", not too hot to touch.