I am having a slight problem with my 01' 23hp Kaw which is on my 52" HP. The engine has just under 800 hours on it. About once a day....maybe twice it will just start sputtering out really bad and the RPM's will drop way down. To relieve this I take the load off the engine(stop the mower from moving and disengage the blades), it doesn't always stop right away, so then I throttle down the engine and pulling out the choke half way helps sometimes. Any ideas on what the problem may be? Perhaps some dirt in the carb? but I'm not really sure. Thanks for the help.