black smoking coming out your tail pipe, your spark plugs fouled and mis-firing. If you are rich you are rich and you have to lean it out the same way . You might have leaking injectors. There was local Supra running super rich and he was blowing out raw gasoline out the tail pipe with black soot. In traffic at a light when he accelerated from stop, the car behind him got tagged with the gasoline and black soot on the head lights and bumper.
