I just got a used RTR Mayhem Buggy. I it said to only have 6 tanks ran through it. Anyways, I started it up today and right off it really rips. I have other Nitro On and OffRoad vehicles but thiws is my 1st 1/8 buggy. After just a minute or so of driving (on street) it seems the thing really takes off at the crack of the throttle but then it will let the clutch slip it sounds like and not take off nearly as hard from a dead stop. Would this be a clutch problem? Or a brake dragging problem? thanks