Your mower isn't getting enough fuel. I suspect that the injectors are dirty. Get a can of injector cleaner and add it to the fuel. If that doesn't do the trick then remove the air cleaner to engine rubber hose to look inside the manifold to see if there is any think caught in it.
Also look at the hose as some times they peel on the inside acting like a valve shutting the air to the engine causing black smoke and may be a knock.
You can then check the injectors start the tractor and open the injector lines one at a time open the engine should die down if this is ok then move to the next and do the same.
Check to see if you have one of the injectors not working then you may need to remove and send for servicing.
Have you replaced the fuel filter and or the air filter. I would start there with the fuel filter, you may have a small spin on or a small inline filter. if you have an in line fuel filter take it off and blow thur it, if it is clear it is ok. If you have a spin on just replace it. Take off your air filter and clean it with compressed air.
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