my 05 arctic cat 400 4x4 is bogging down and dying when in 4 wheel drive and under a load like in mud or something? help. it runs great on open field or road but when i am going through a mud hole or something and i put in 4x4 it acts like it has no power? whats going on? gas is good CV joints are fine. air filter clean no snorkel. gas tank vent hose is fine. on the top of the carburetor there is a hose fitting that doesnt have a hose on it. it is black i think its just a vent hose but i may be wrong. if you can help email me at jakentausha1@yahoo.com.