1998 neon rt 2.0...obd code p0172...p0340

runs at high rpms ok....at idle after stopping sometimes dies...have to hold gas pedal down to start....replaced pcm...no change.... replaced wires no change...replaced in tank fuel pump no change....replaced cam sensor no change... about to lose my mind or put a bullet in it!!!!!! please help...took it to a shop and they couldnt fix!!!!AHHHHHHHHHH

Okay so you have two different codes! First of all if you used a cam sensor from anywhere but the dealer take it back and get one from the dodge dealer. Aftermarket ones are very sketchy, most don't work! Next check the wiring to the crank sensor, not the cam, see if it's meltted or brittle and soaked from oil. If so you're going to have to fix that. As well has anyone checked that the cam timing is correct? What is the fuel trims at idle? what's the tps reading? map sensor reading? upstream 02 reading? When it starts will it idle and stay running? is it worse hot or cold at idle?