I have a 2006 Crossfire 6spd. At random and getting more and more often the car will stall or buck forward. The stalling is only in neutral or clutch in, so I think the bucking is just the wheels keeping the engine spinning.

I've got 3 trouble codes showing.
P0442 for an evap leak that I think is unrelated as it's been there for a while.
P0104 for the MAF sensor. I've had issues with this in the past.
P0221 for the throttle position sensor. This one's new to me and from the research I've done seems like a potentially likely candidate.

If it is the TPS then what I'm looking for is whether it's the sensor on the pedal or the throttle body and where to get either one of them. They seem to be unavailable everywhere I've looked.

Thanks for any help.