Not sure what to search for so I'll describe the problem:
My 2.5 engine seems to run fine, blue smoke, decent acceleration, etc but when I brake, the engine will seem to idle down and then suddenly rev up like I'm hitting the gas with 2 or 3 quick pulls on the throttle. As the brake is applied, it spins the spur gear.
Thing is I'm not and the throttle is not moving (pulled the cover off and observed).
Any Ideas? I'm hoping I just need to tune it better.
For reference, it's on a T-Maxx 2.5