Is your throttle pedal from the same vehicle that the harness/tac/tb/pcm is from. If you have any of those parts mismatched it will cause all kinds of issues with the DBW system.
If it matches follow this guide
http://easyautodiagnostics.com/gm/4....sensor-tests-1 to test your accelerator pedal sensor.
If that tests good check the wiring harness between it and the TAC module.
For the MAF sensor make sure you have 12v on the pink wire and ground on the Black/white wire.