1992 Toyota Cressida smoke

I have a problem in my car related to a smoke which comes out of the exhaust pipe. It seems to me as it caused by an excessive fuel enters to the engine but also I observed a vibration in the engine.
my question is what is the causes of the black smoke and is it related to the engine's vibration or is it another issue?
(may be the problem of black smoke is not related to the vibration)