1988 Dodge Daytona engine has problem's.

My 1988 dodge daytona makes a lot of bad knoking sounds and it idels ruff. Some times it will die and other times it wont. When I put it in to gear it makes a really bad sound and I have to give it gas all the time or els it might stall or just die. I think it I could be running on 3 cylenders. It all so sometimes blows out black smoke when u first start it. When I drive it it shacks a lot and the rpms are idel hight and when I drive it the brakes are hard and stiff.