Mower will start and run but has lost power. Seems like it might be running on one cylinder. Changed plugs and checked new plugs after running - one was normal and the other had alot of carbon. When I engage the blades the motor almost stalls. I can cut a little grass very slowly, and cannot take a hill with the blades engaged. I had a little black smoke but not much. Thanks for any help
RPMooney
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