I have a 1992 Evinrude 9.9 that runs like a champ 100% of the time except that it's very hard to start cold. If I give it the very smallest shot of starting fluid it will start immediately with a half-hearted pull of the cord and be perfect the rest of the day. I've tried all the usual things, fresh gas, new plugs, the 5 minute Sea Foam treatment to clean out any buildup, etc. but nothing has helped. You guys have any other suggestions?