With really OLD tunes (say 2 years ago), there were issues with the TC disabling itself when the car was given wot. The TC tuning was wrong and if the rear wheels spun (which is the tendency with an Edit'd car), it would disable itself as it couldn't control the wheelspin. Only solution was turn the engine off and then restart again untill next bootful =) Take the "flasher box" back to your tuner, and request he modify the program, unless you have other hardware issues with the ABS Sensors or similar. PS: Traction Control still appears to not work so well at 100km/h in the wet. Be warned!