carsonbirchfield

Hello, i am new at this so forgive me for any mistakes ahead of time. I work for oil and gas co. in charleston wv and the mechanic is pulling his hair out over problems with a 2008 420 rancher. he has replaced the injector,tps,and cleaned everything in the carb several times and the thing still has a bad hesitation just off of idle. When you try and pull out it stumbles and then takes off. Any advice would be appreciated and i will pas it on. thanks