i was breaking in my t maxx 2.5 today and when i was breaking it in when you go slow it jerks then moves then jerks again, but after it got going it is fine. the idle is a little high so when i stop it will stay still then you hear a click and it jerks again. i lifted the tires off the ground and you still hear this click. but if the truck is off and you roll it it goes fine. Only when i accelerate slow it does this jerking and clicking sound but once it gets going its fine. it seems to me like something is locking up. also if i get on it slow it like has a hard time moving but once it clicks and jerks its fine. is this normal?