Anybody experience this? I have an 04GTO, and usually run with the traction control off. My wife drove it the other day with the T/C on, and said when she got to 60 mph, the throttle would not allow additional speed and the engine acted like it was being prevented from going faster. I trie dit, and sure enough. It acts like the speed limiter is preventing the car from going over 60. Any suggestions? I have an appoiuntment to take it to the dealer tomorrow.