My car is a 2002 GT and it has been surging lately. My mods are steeda pullies, t/a, slp catback, and 4.10 gears. I had the t/a set at 14 but i put it back to 12 and it only helped a little bit. This was happening before the gears so i dont think that is the problem. It gets a lot worse when i put on the ac. My car also seems to be loosing horsepower. I lost to a stock 2003 automatic GT and i had a good launch and good run. Anyone know what is wrong?