I have a 1994 DT40. Ran perfect until I got to end of can of gas. Started to run rough. Changed plugs but only seems to run on one of two cylinders. Both plugs are sparking. One looks normal other was completly dry and not discolored. Smelled raw gas and smoke or vapor increase. Starts ok but falls on its face when put in gear. Used alot more fuel and oil than normal. Any thoughts would be much appreciated. Thanks
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