We had fits trying to get mine tuned, The hacked up butterfly plate didn't help either. I thought I remembered it being 0-5 volt but needed to make sure. Thanksidle is supposed to be around 0 volts i think wide open was in the 4.2 area dont remember i had to play with this a lot the other week. I know the the xx has a efi fault for low setting out of wack and max setting out as well. The tps sensor was the issue i had with the +3 TB i think it was just the sensor itself. But fyi when it gets bored it changes the low side setting and you have to recalibrate the ecu for it to be in spec
You'd need the vortex to adjust the iac, I had to unplug the iac to get a good idle.Mine is running at 2200rpm at idle with the +3 throttle, haven't look at it yet, can it be the iac calibration?