So I got a 2011 John Deere D110 with 50 hrs on it. New fuel filter, fresh fuel, carb clean, new air filter, oil correct level, new spark plug gaped correctly. Starts up on choke when cold and then will run rough or die when taken off choke. If I pull the vent hose OFF of the oil fill tube (crankcase vent tube) that pulls vacuum from the fuel pump. .. the engine smooths out and purrs like a kitten! Plug it back in and instant stumble and die. Any Ideas? ?
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