Q: My throttle position sensor can not be fixed

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My car has been misfiring and the engine light popped up. My car will not accelerate at times. Checked the code which comes up as p0122. I had a mechanic replace the TPS and the jeep was fine for 2 days, then the car was misfiring again and the engine light reappeared. Same code popped up. I took the jeep back and the mechanic put a "higher quality" TPS in my vehicle. After test driving the car, the engine light appeared again. The mechanic said it might be a electrical issue. So he replaced the throttle position sensor pigtail wiring connecter that goes to the harness and he swore that would fix it. The car was fine for a few hours and again the car is misfiring and the engine light came one again with the p0122 code. The mechanic said he doesn't know what it could be and to take it to the dealership because it can be my computer that is bad. What can be the issue here ? I can use the help

My car has 80000 miles.
My car has an automatic transmission.

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