My lawnmower has been acting strangely the past few weeks. After about an hour of cutting grass it will begin to miss and run poorly. It is also difficult to restart one it starts to miss. The mower is about 2.5 years old and gets used about 75-90 minutes either once or twice a week. It is a B&S 6.75 Craftsman mower

I put in a new air filter today (the old one was extremely dirty). I also dropped the float bowl (it was clean) and blew out the banjo bolt/jet that holds the bowl on. I pulled the spark plug (it looked fine) and wire brushed it for old times sake. I also filled the fuel tank with fresh gas.

The only other odd thing is that I used to be able to cut my grass on one tank of fuel but now I can only cut 75%-80% before the tank is empty.

Any thoughts? I'm not too keen to throw a whole bunch of $ into the mower but it seems like it should be an easy fix.

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