papi may have it. \\; I'd tend to agree. Black smoke coming out the exhaust while trying to accelerate? \\; Sounds like there's some sort of ignition problem, check all wires, including battery termail end for being tight. \\; Pull those plugs and check which cylinder is not firing. \\; Chances are, one of the plugs is/are black and wet.
I checked for intake carb manifold leak with starting fluid. no leak. Checked every wiring connection and ground I could get to. They all look ok. Any other suggestions?