We have been getting a p0121 code, so we cleaaned the TBS. Got worse, idle went up, so we replaced it and the pedal postion sensor. Same problem, idle at start is at 3-4000rpm,, goes down in drive but when you accelerate goes back up. Any suggestions?

 

Welcome to the site, P0121 has a relation to the harness rubbing .
As per
https://www.obd-codes.com/p0121

Check the wiring harness for chafing against the bracket under the EVAP valve.

 

I'd guess at either a broken wire or a bad MAF.

Sounds like The #1 signal wire is not connected somewhere between the TB and the ECM.

Are there any more codes or things you didn't think were relevant?