Hello. I have a 1990 3 cyl. 60 hp evinrude on a sc 175 sea nymph. My problem is. Sometimes it starts pretty well and other times it will just crank and not start at all.I suspected the ignition switch or hoping anyway it is the problem.I haven't replaced anything yet. I did check the spark on all 3 cyl and they all spark but sometimes it will skip a cyl. or I didn't see any spark on any cyl.Any direction on this would be appreciated. Thanks