Robert. I read your other post. Your winter mode will start you out in 2nd gear. So you will want to stay away from that. EC tune does not do anything with the W/S mode. You should not be getting all this bucking you are talking about with or without traction control on or off. Make sure you didn't unlodge the throttle peddle from it's mount. If you did, this will limit your throttle peddle's movement. It slips onto a flat piece of metal. I can't imagine you having a throttle body problem, and you stated in your other thread you have replaced the pump before. Only thing left would be fuel. Check that throttle peddle....you really have to get under to see...if it is mounted properly.