just bought a rtr matrix tr arena rtr.. very excited about it.. having a problem.. throttle servo is acting funny.. ill give the truck gas and it takes it sweet time going to idle when i let off the gas.. it acts like it isnt strong enough to go back.. i have to hit brakes to set it back to idle.. tried messing with linkage.. no luck.. so im assuming the servo isnt strong enough?? some advice would be great.. cant wait to go racing