Engine starts fine- but during during "mid-point" of warm up, it will stall if left to idle?

The engine starts fine- but during during "mid-point" of warm up, it will stall if left to idle. It will run in "park" OK, but will stall when placed in reverse. If left alone for about 10 minutes, the problem goes away, and the truck runs fine for the rest of day. After warm-up, all is well. The problem is hardly noticeable if you drive forward for the entire warm-up. No codes from scanner. New plugs, wires, cap/rotor, IAC, intake air temp, clean throttle body. The situation is very predictable, run 10 minutes, stall for 10, then OK. Very similar problem to other Dodge on your Web. Did not replace O sensors, (2).

Fuel pressure good thru entire range. The truck usually carries a camper, thus the low miles. It sits idle for weeks during off season. (A clue perhaps) Is it possible for a sensor to "freeze"? Will probably go to dealer for overnight soon.

Final Disposition -- The nose on the starter broke off and flew around, hit the crankshaft position sensor and bent it out of position. New sensor and starter--ALL IS WELL !