I just bought a used HPI Nitro MT from someone who claims that the truck rip's at 60mph. I can not get the thing to stay running![>:] If I'm lucky enough to get it going, it idles rough and won't accept any abrupt throttle. Even with gradual accel., it eventually just die's like someone plugged the exhuast? The guy I bought it from lives at sea level & I'm at 5500ft above sea level - is this the issue? Is there a basic procedure to follow in determining what the scource of the problem is?