Producing too much black smoke and lost power take off

Black smoke indicates incomplete combustion - the mixture is far too rich for efficient operation, or you have poor ignition. Check the engine service codes; they may indicate what has failed. Almost certainly your spark plugs are fouled. Clean them and check the gaps to make sure they are within specification, and replace the plugs if they are significantly eroded. Verify that the spark plug cables are good, and if your vehicle uses a mechanical distributor, check that and the rotor also.

That's a start on the diagnosis. (Usually if the engine is worn out, you'll have blue smoke from burning oil, not black smoke. Do a compression test before giving up on the engine.)