I changed the throttle position sensor code p 0121 still comes up

Once you had replaced the TPS did you use a code reader to clear the code . If not this is why you still have a code caste. If you did was there more than one code present before the fix or did the other code come up after the fix. How long after clearing the code does it take for the code to return ?

@kerr1966 yes leave it disconnected for at least an hour and turn headlights one to help drain any residual power thats stored in the OBC. then you need to do a proper reset. When you start the car do not rev the engine you have to let the engine idle for 5 minutes uninterrupted then after 5 take it for a drive and do a series of stop and starts that are calm . no hard acceleration. no revving of the engine . you need to do a break-in for the TPS so it learns the driving curve . If you have a heavy foot dont for at least a day or two .Drive like an old lady . This will also clear the IM so if you need to have a emissions test done it will take a while before its ready. A few days of normal driving will do that . Hope this helps