I got the 400 from a guy who hit a deer with it he said. broke his arm and collar bone and wanted it gone. most of the plastics were cracked or broken but it ran great….for a while. Now I have to remove plug, and spray carb cleaner in to get it to start, then it wont idle I have to hold slight throttle to keep it going, and when I give it throttle to go it bogs down and cuts out. What is going on with it? rebuilt carb, new plug, messed with idle and air screw, no change.