my 1995 3500 has high idle and code 22. Replaced TPS, throttle body gasket, IAC, and no obvious vacuum leaks to be found. When i give it gas while driving the Check engine light goes out but comes back on when i let off the peddle to shift or come to a stop. Any suggestions?

 

Welcome to the forum. Code 22 means the TPS returned a sense voltage less than 0.16V. The TPS receives 5V reference voltage and returns some intermediate voltage depending on the throttle opening. With a multimeter verify it's getting 5V and returning >= 0.5V with key on, engine off:

Terminal A, GRY wire, 5V Ref, from PCM
Terminal B, BLK wire, ground ref, from PCM
Terminal C, DK BLU wire, TPS Sens, to PCM, should be > 0.16V

 

Thank you! So all but the blue checked out ok. From the PCM im only getting .024V to the blue wire and from the TPS side im getting .027 from the blue wire

 

Can you read higher voltages by manually opening the throttle valve? Terminal C should put out from 0.5V to as high as 4.5V at WOT. Is it possible that the TPS is misaligned on the throttle shaft?

 

Did you figure out what the issue was? Because I’m having the same problem and I’ve replaced the tps the a iac pcv etc. I’m lost