I have a Snapper model 7800785 with B&G 12.5 hp Intek engine. I just bought it used, but did drive it around a bit before this problem started. When I release the clutch/brake, the engine dies without any indication of strain. I had changed the oil & filter, fuel filter and spark plug, and it starts and runs great with the pedal down. With the pedal down, the blades will spin up fine, too. Checked the seat safety switch with a meter, works just fine. I'd sure like to know which is the more likely issue to check first.