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I have a 20hp 46" Scotts john deer ride on. The last time I mowed the lawn, the tractor sputtered a bunch of times but I finished the lawn and all was good. But today I go to mow the lawn and I noticed it was slow to start up. I get like 1/4 done with the lawn and the sputtering starts. Its get horrifically bad and the tractor stalls. I started it back up playing with the choke but I couldn't keep it running and it stalled again. I checked the fuel and oil but those were fine. Can anybody help me here? Could I have a blockage in the fuel line? The tractor was tuned up last spring. I also really need to get the lawn-mowed cause its high as hell and winter is quickly coming.