hi guys newbie here with question regarding nitro rustler, bought one broke it in all seemed well runs great on tarmac low temp and uses full tank. The problem is when i use it on mud and thin grass the car will go good for 7 laps then suddenly cut out with fuel still in the tank, then after couple of secs start up again and finish rest of the tank. Not sure but also think the temp gets hotter any suggestions done all of the traxxas test and ok. the guy from my lhs says it is unlikley the piston is at fault as it would do it all the time no matter wot surface. any suggestions.