I sold a friend of mine a blazer that just before he bought it I replaced the TPS now he has these two codes that keep coming back.
He also replaced the TPS thinking that the other one was defective but still there he has cleared the codes and it still keeps coming up.
Once in a while it will start missing and cutting out and then die,, you can restart and runs fine for another 40-50 miles and then same thing again
Any experience with this???
He also did the cam sensor
2 O2 sensors

 

Start here:
P0122 - Throttle Position Sensor Circuit Low Voltage
P1122 - TP Sensor Circuit Intermittent Low Voltage

Then make sure that you are getting +5V on the reference wire to the TPS sensor, a good ground on the ground wire, and that you have good continuity on the sensor return to the PCM.