ok my godfather bought a Traxxas Nitro Sport RTR i believe and he bought about maybe 4 years ago and i have been fooling around with it and i noticed that when i hit full throttle the car wants to bog down and stall. i tried adjusting the screws on it but still it wants to stall when you get to full bore and sometimes it doesn't do it but most of the time it does. what is the problem with it? HELP!! thank you!