I have a 1988 Mercruiser 165 that is giving me fits. It is very difficult to start and once I get it started it will stall when shifting into forward or reverse. As well as sometimes when I shift to neutral. I have replaced the plugs, rotary button and Dist. Cap. When attempting to start the engine sounds great but it will not start. I am at a loss. I cannot figure out what is going on. Also, can anyone tell me the RPM specs at idle and while in gear?