If black smoke is visible it generally indicates unburned fuel. That
suggest to me your fuel air ratio is operating
outside design parameters.
The problem could be a simple as a clogged fuel orifice, or a faulty plug
wire. I suggest you take the vehicle to a competent technician, who has the
proper equipment to analyze and correct the fault. If your vehicle has
"check engine" light, I'm surprised that it is not elluminated
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