I've got a 1977 35 hp evinrude short shaft, was running the other day and the motor just shut off, would not crank back up, got home pulled the plugs and not getting fire, getting fuel and compression is good. checked all the connections and made sure everything was grounded good. still no fire, let it sit a few days, come back and hit the key and it fires right up and runs for about a minute and then dies again, check plugs for fire and none. If it sits for a few days it will get fire for just a minute or two then nothing after that, tried new plugs also. I know there's a few things that could go bad, cant see the both the coils going bad at once, I'm leaning toward the cdi pack. Just wanting some opinions before I start ordering some parts. Anything else that I'm missing. Thanks