A friends dad had used our 570, got stuck going over a tree. I told him to back off of it and put it in 4wd and go forward over it. After several hours of riding and clearing our hunting trails, he mentions to me that it's running rough and keeps shutting off. I look and noticed that he had it in ADC 4wd. Idles very rough and won't stay running at all unless you hold the throttle and even then it still tries to shut off. Anyone have any idea or a starting point on troubleshooting something like this?