1972moustacheride

Hey guys I just fired up the 5.3 in my 72 c20 and had no throttle response at all. The truck fired right up no problem. I checked all the connections and they look good. Any help would be greatly appreciated. My harness was done by 150tunes

33willys

iTrader: (1)

I'll take a wild guess and say it's a DBW! No idea what the engine year is or the year of the tune but another wild guess is that TAC and APP are mismatched to the tune.

ls1nova71

iTrader: (4)

^^^^^ This sounds like the issue to me too. Did you get the TAC module, PCM and gas pedal out of the same truck?

1972moustacheride

Ls1nova71 yes everything is out of the same vehicle

ls1nova71

iTrader: (4)

Check to make sure you have power on the pink wire on the TAC module plug.

33willys

iTrader: (1)

Reread post #2. Check with your tuner and see what year the tune is. If he put in an '05 tune (popular) then your TAC and APP will not work. To match the parts with the tune you will need TAC #12588923 and APP (pedal) # 15821777. You may already have the correct TAC, hunt around and see if you can borrow the correct APP so that you can confirm the combo will work.