Car stalls sporadically

Is there any time that this typically happens? Coming to a stop or sitting still? Or driving down the road?

Here is a guide that covers the common things that cause this. Let's review this and tell me if there is anything that has not be covered and we can go from there.

https://www.2carpros.com/articles/engine-stalls

Does it seem to sputter as it stops like it was low on fuel or is it just shutting off, like you were turning off the switch? You say it restarts okay, does it need to crank longer than normal? Does it seem to matter what the fuel level is?

Okay, so it takes 3 tries turning it over to start. Try this if you can get it to shut down. Turn the key on, but not to start, just to on. Do that two or three times. Now try to start it. If it now starts up the issue is likely a bad oil pressure switch or intermittent connection to it. The reason I say that is that the system on that car works a bit different than modern cars. The pump relay on it only works to prime the fuel system, then shuts off. You crank the engine over and it primes the system, the engine starts, the oil pressure triggers the switch which then powers the pump on. A quick way to verify that as being the problem is to try the key test to start it, then find the red fuel pump prime connector under the hood. Now use a 20 amp fused jumper lead to jump power from a keyed battery feed like fuse 6 to that fuel pump prime circuit. That will bypass the relay and the oil pressure switch. If the car now runs fine the pressure switch or the connector on it is likely the problem. This is a common thing on them as the pump power goes through that switch and they have a bad habit of leaking inside the switch. It was one of the reasons why the later vehicles used a different safety system to shut off the fuel in an accident. The idea behind that switch was if the engine was shut off or if it lost oil pressure like the car flipped over, it shut off the fuel pump.

Please let us know what happens.