My car and ECU are 1998 models. My engine is a 2004 LS6 with cam and blower. I have upgraded my OS to the HPTuners Custom 2 Bar OS and I have installed a 2 bar MAP. Car has OBD2 gages in it so I can read many of the ECU's parameters without the scanner.
Now my issue: Car runs fine. Idles fine at about 13.5:1 afr, MAP about 65kpa, UNTIL I plug in and attempt to scan the car. When the car is plugged in to the laptop to scan car is not drivable, idles rough at about 10.5:1 afr, and MAP reads 102 to 105 kpa. While plugged in to scanner any throttle input makes the car stumble. It smokes and fouls plugs. It is repeatable over and over. I have already erased the "vcm scanner.cfg" file and let it load a new one, but the issue persists. It's like the scanner is giving the car commands seperate from the tune. I've looked and the VCM tools are off.
Has anyone else had or heard of this issue?