The neutral safety switch will prevent it from cranking if it isn't in park or neutral, but it won't cause the stall.
To me, it sounds ignition related. If you allow the engine to idle, does it stay running? If not, do me a favor. Check to see if the coil power supply is losing power when this happens. I have no schematics to look at because of the ignition change, but at the distributor, there should be a power supply for the ignition coil that is hot with the key on and in the start position. If you find there is a power loss, I would next check the ignition switch for wiring issues.
Let me know what you find.
Saturday, April 16th, 2022 AT 8:41 PM