I'm suddenly having a very strange problem with an otherwise reliable old 1983 Johnson 70 hp outboard. It starts and runs great. Problem is, when I go full throtle it won't produce it's normal power. Very little power in fact. However, if I push in on the ignition key engaging the remote primer - it runs great! In fact, it runs better than ever! Most of the time, if I let off the key, the problem returns and the engine boggs down again. But, sometimes if I hold the key in for awhile, or push it in repeatedly - the problem temporarly goes away. At least for the leg. If I idle down and try to go again the same problem recurs. Anybody have any ideas what my problem could be?Thanks,BobBTW... This problem started suddenly. It didn't creap up to bad.