I just rebuilt the carb on my prairie due to it sitting up for awhile. It would not idle on its on unless the choke was out. Now after rebuilding it, it idles fine with and without choke. But when I try giving it gas it will rev up and then start sputtering. I also have a K&N air filter. Any help will be thankful.

 

where did you set the mixture screw? Have you tried adjusting it? If it is out of whack, the carb will sputter and hold a "high idle" for a few seconds after you let off the throttle.