I have a 1989 PU55 jet 3cyl. that lost power today. Planing fine then fell on its face, would go at low rpms, but not rev up much. Motor was "sneezing" also. Limped back to dock stopped several times, then motor wouldn't start. Pulled plugs. Top had black looking oil coming from around the base, middle was ok, though oily like the top, and bottom was black with carbon. any help would be great, and thanks again.