HOW CAN I MAKE MY BIT CHAR G GO FASTER AND RUN SMOOTHER? I ALREADY HAVE A 3.0 MOTOR. OH YEAH IT ALSO STALLS SOMETIMES....LIKE I PRESS FORWARD AND IT WOULDNT MOVE. THEY ONLY WAY IS THAT I HAFTA MAKE IT GO IN REVERSE THEN IT CAN GO FORWARD AGAIN. HELP ME OUT PLEASE