I have an older 2cyl 16hp Briggs and Stratton engine on my old garden tractor. I inherited it with my property purchase, so I have no idea how it's been maintained.
I put new gas in and changed the oil this spring and started working with it. It runs reasonably well but it was surging quite a bit, especially when it got warm. Also, it wouldn't idle down properly.
On the last refueling I dumped some Sea-Foam into the gas tank before filling up. Now, however, it seems that the RPMs are low when at full throttle and the tractor will stall out when I put it into gear. The tractor has a belt-drive transmission.
I'm thinking of starting with cleaning or replacing the spark plugs and possibly replacing the fuel filter.
Any thoughts/suggestions on what I should do?