Last week, I bought a WD that had been sitting a few years. I basically rebuilt the ignition system (new plugs, wires, rotor, cap, points, condenser, coil). Also, I put new manifold gaskets on, as the old ones were leaking, so it was not creating vacuum through the carb.Now that that is all taken care of, when I try to fire up the tractor, it will only start if I put my hand over the intake of the carb, and will then only run for a few seconds and die. I did clean out the carb and put new gaskets and a needle and seat in it. I know it is getting fuel to it, when I pull the plug on the bottom fuel runs out in a steady stream. Has anyone else had this problem, or know what it could be?