my 2000 dodge ram is bucking while driving and stalling at idle

Changed spark plugs by chance? If not could be multiple different things could be coil pack could be fuel pump

when A fuel pump times up, it would die on you. Your van won’t even start. Someone wrote about the ECM being above the engine is a bad idea due to the heat messing with the circuit. He’s absolutely correct. Still trying to figure out how to get it covered up or moved away. Also check the coolant and make sure there’s no air bubble. That could also cause the sensors to be inaccurate.