2001 Mercury Villager throttle position sensor or idel air

Check engine light is on, when engine is cold, start up and put into drive, engine kills, start up and again engine kills. Let engine run a couple of minutes and travel down street to stop sign, while pressing on break peddle, engine acts like it wants to maintain rpm and speed, have to put into neutral and back to drive again to go, also to get going I have to push peddle to floor for a period of time and then it takes off. Once van is warm and after traveling 4-5 miles the van runs great the rest of the day as long as the engine is warm. Which of the above sensors is bad, already checked the fuel injector regulator and that is good.
Thx