I'm working on a Tmaxxx 3.3 for a friend... When I start it off the ground on a stand the wheels are turning...(should they be?) and then I go to put it on the ground to run it dies.. I loosened the clutch to the point of the truck doesn't move (i know it's too loose) retighten it a bit but it still dies when it touches the ground. any ideas whats wrong? Thanks