I have a 48'' toro hydro walk behind. Proline deck, Kohler command SP15 engine. The mower itself is an 08 and I dont think any major components have been replaced. Mower model # 30528 Engine Model # CV15T Now to my problem. . . The mower will start revving a little once it goes then it will die. It will start back up first pull and idle fine but as soon as I engage the pto it will die again. Seems to be worse uphill. It has gotten worse over the past week that now I can't get two feet. I have changed the gas cap, fuel filter, fuel line. I've drained the tank and used new fuel. I took the bowl off the carb and made sure there was no water in it. Dropped the tank and cleaned it out. I've even took the carb off and cleaned it out real good. Now when I cleaned the carb/tank out it acted much better but slowly started to act up again. (it was doing this at the beginning of the season) I dont consider myself a mechanic even though I work on these a lot. I think I could fix it if I could just figure out what's wrong with it. Anyone have any ideas?