hall cell unit in dist

sure it is not vapor locking? check carb next time to see if dry or flooded before pumping/holding to floor after engine stall.

BR most time works or it does not..but could be over heating?

also look at fuseable link for IGN and see if you see any sings of burnt/melt/soft/swollen wire.

make sure underhood harness ground wire on firewall is good.