I have a 30 hp mercury outboard it is hard to start and when it does it starts and then after a min it starts to skip. I have rebuilt the carb and fuel pump, and also replaced the key switch that was bad. I had replaced one of the coil pack thinking that was it still but still the same out come. I have looked over the wiring from the trigger to the rev limiter and to the plugs on the coil packs but haven't found the problem yet . Not sure what Elese to looks at now