I have a 1992 20' Larson with a 165 HP 4.3 Merc. Last year I had issues with the engine and the timing was out 8 deg. So with the timing in check and a full tune up that inclcuded, plugs, wires, dist, ignition coil, fuel filter, new 4 blade 21 pitch prop. When all that was done I ran the boat...