Sputtering While Driving...

I noticed after I got my A/C done and TP sensor done my car started sputtering and acting like it was going to die on the freeway and from a standstill. On the freeway the RPMs arc and the car acts like it just wants to die. From a standstill the car almost stalls, and it has a couple times, but if I give it a good amount of gas for a second or two, it seems to be okay for the rest of the time. The problem seems to be getting worse, and I have no idea what it could be. Any help would be greatly appreciated.

Bogus/mis-adjusted TPS would be my first guess.