Hi, I have a 1987 3.0l merc with i don't know how many hours on it. Compression is good (138-142) timing set 6 BTDC, dwell at 31, new plugs, wires, cap, oil, filters, new fuel, new coil, carb rebuilt, the list goes on. It starts up well, and takes off well in the water-aside from a hesitation at...