I have a 2005 48" Scag Tiger Cub with a 19 HP Kawasaki motor with approximately 140 hours on it. It runs perfectly fine for a while and then will start to spit and sputter for a bit and then go back to running fine again. To me it acts like it is running out of gas. I replaced the fuel filter but still does the same thing. I have been using the mower all season and it just all of a sudden started doing this. Any ideas or common problems you guys have been seeing with these mowers? Suggestions what to check? Thanks.