I've got a tmaxx 2.5 2-3 months old. when I turn the truck left and when i let go to straighten up it stays turning left. this does not happen when I turn right. I've taken off the steering linkage and checked the servo it works properly.any ideas? one more problem when I get on the throttle the motor revs up like it should but the truck doesn't move like normal. any ideas on that?