Quote Originally Posted by avguy View Post
One minute of cold warmup is right in the ballpark time for the ecu to close the loop, so there's one very quick and easy test you can try, in order to see if this is closed loop-related. Just remove the upstream O2 sensor connector before doing the first cold start. That will force the ecu to stay in open loop, and you'll find out if it will keep running in that mode. If it stays running, then the issue is something which participates in closed loop processing.

But if it still stalls the same way with the sensor disconnected, then confirm it's not being starved for fuel by spraying a small bit of carb cleaner into the intake, right at the time it begins to stall.
BTW you need to be listening to avguy. He knows his stuff and gives you easy diagnostics to follow.