1997 GC 3.3 engine infrequent engine shut-off

[Spit]

My 1997 GC 3.3 engine aprox. 157,000 miles has started to randomly shut off.
I only drive the car on weekends and the wife says it's happened 3-4 times to her over the last month. Seems to happen when stopped/idling at a light, doesn't really run rough or miss prior to shutting down...it's more BAM off it goes.

Otherwise the van runs well and it hasn't really happened while moving, and it always restarts fine and doesn't stall again for a week or more.

I'm not seeing any Codes on the OBD-II.

The other day when it shut off while I was driving it, I had been drivng for 10 minutes or so engine fairly well warmed up, stopped at a light, it seemed like it started to run a little rough the RPM's dropped from 900 to 700, so I shifted out of gear let it run free in Neutral, it seemed to recover..back to 900 RPM. I dropped it back into gear and semed okay for 2 seconds then it just shutdown...no misfire etc. seems like it was an electrical shut down.

Any ideas welcome. What would you check?

Spit