I have a Scag Turf Tiger. Just bought the replacement 22HP Kawasaki engine for it -FD661D-ES02. Last time I took it out, it ran out of gas on me, so I filled the tank and finished the lawn. Now today when I took it out, the mower is bogging down and stalling out. It will start back up again, but this is a pain! Anyone know what the problem could be? I checked the fuel filter-looks clean and there is gas in it. PLease HELP!