I've got a 2006 mercury optimax 135. It will idle fine, come off the trailer fine, but when I put it under load to come up on a plane it bogs out and won't get up. Then goes into guardian mode. I've replaced fuel pump, plus, wires, oil pump, oil reservoir float. Computer diagnosis says it's getting fuel and oil fine. Everything is good. So I'm left with thinking it's an electric problem that's throwing it into guardian mode. I just don't know where to begin. Any suggestions?
