1987 samurai 1.3L It was running fine drove it about 20 miles or so filled up with gas and headed home when i pulled in the engine shut off and would only start and run if i gas on it. now the engine will not idle and blows black smoke while running. I just give it a complete service 150 miles ago oil,plugs, wires cap, button, fuel filter, fuel pump, air fitter , o2sensor. Any suggestions??