05 500 suzuki motor, after I start to plow (everything working good at first) I can make a couple runs down the drive then the throttle cable gets stiff and quickly freezes up. Then it runs wherever the throttle sticks. I've taken the throttle cable from both ends and lubed it. After it sits for a while in the garage, it frees up again. Then same thing when I take it back out to plow. Seems that the sticking is coming from the carb are. Is that possible? Could I have moisture in the carb that gets froze after a short time? I would think as the motor gets warmed up. I should have no problem. Very frustrating. Any ideas?