are you running a failsafe?
ORIGINAL: TrailBlazer250
my carb opens fully when the servos go crazy. after the carb opens fully the car doesn't respond at all. its as if the receiver or transmitter is off, but they're not, and the battery's are full. the car swerves off the road, and the carb opens fully, until it crashes into something, and i shut it off. everything works fine until i take it into snow. maybe there is some coincidental interference.