My 2004 Laramie has stalled out twice now while driving, didnt make any loud noises, engine just died. Still had power everywhere. Would not restart initially but restarted when held down on the accelerator. Error codes are Intake Air temperature sensor and Thermostat rationality. Any help would be appreciated.

 

What engine do u have? Sounds like what happened to my '04 Hemi. It was the crank sensor. Cheap and easy to replace, under $30, located on right side of block and attached to block with 1 bolt, and the wiring harness clip. Took me 5 minutes to swap out.

 

Since your code says IAT sensor, I recommend you replace that first. It's inexpensive and easy to get to.
Gas mileage will sometimes get very bad right before the IAT goes out.