Do you not have an SES light? My first thought was a bad MAF sensor or TPS sensor. I can check my reference manual tonight and see what it says. I'd hold off on pulling the whole transmission, sounds like something else. Check the 12V power supply at the main connector to the transmission to see that you do have 12v to the TCC circuit and the solenoids. Also, did you remove any grounds from the PCM? My first trans rebuild resulted in pinching wires from the cam sensor in between the bell housing and block and the truck wouldn't start. Could you have got some other wires between yours?