INTERMITTENT IGNITION ISSUE

Sudden engine failure or misfire is nearly always electrical. A cracked spark plug insulator is not going to cause an 8 cyl engine to die, it will misfire.
I believe you have an open cct somewhere, not a short cct. The fact that the engine starts 'right back up' after stalling sounds more like a loose connection than a corroded connection.
Becomes a process of elimination. I would try a new coil &/or bal res.