I am tuning a stock 05 GTO/auto, and have a huge problem I can't find. It won't power-brake, and when taking off from a stop in low, has NO bottom end. NONE. Once it's moving (about 2 sec) it accelerates nicely. Then, when it shifts into 2nd, it lays down again for about 2 secs, then takes off. I have disabled everything in the torque management tables I can, but to non avail. The car ran like this when I got it with the stock tune, but I can't seem to find it. Any thoughts. Thanks.