Well if the engine is already up to temp, then I think at 70/75 ambient, we are long past needing choke, and I'm past thinking flooded.
At this point I would look for an interruption in the fuel delivery system, starting with the fuel-tank vent.
I would think verifying a spark after it quits would be the next step because it is so easy to do and can eliminate the spark as a problem while the engine is still warm.
