Hello i was looking for some help i got a 2003 polaris predator 90 for my son and at first it ran great now it idles ok but when you give it gas it bogs down and will stall if u dont let off it will run if you plug off half of the air box tube i tried adjusting the carb but i didnt seem to help maybe im adjusting it wrong or something i pulled the plug out it didnt seem wet but it was kinda black and sooty i cleaned it but it didnt help the only way it seems to run good is if you plug off half of the air box tube any help would be greatly appreciated