Used my lx255 15hp kohler over the winter for some light snow blowing,ran just fine. This spring I am having difficulty getting it to run smoothly, changed fuel, added fuel additive, changed spark plug, nothing helped. Runs OK at a higher rpm but very rough in lower speed. Any advise thanks

Hi,
I think I would begin by running a few tanks of gas through it. Only supposed to run it slow for a few seconds before shutdown, anyway. As a note, checked the air filter?
Peace,
Clarke

Thanks I will give it a shot