Kind of sounds like you have a water in your float bowl. My 682 with the 18hp command had the same symptoms as you describe. I took the top off of the carb and there must have been almost a 1/4" of water in the bottom of the float chamber.I noticed the problem going from forward to reverse while mowing the yard.It would start skipping and sputtering. Cleaned the carb and fuel tank and problem went away.
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1641, 1541, 682 with 18hp command engine and hydraulics from a 782. 1872 with a power angle blade.
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