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2004 150 Optimax Alarm At Throttle

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  • 2004 150 Optimax Alarm At Throttle

    I have a 2004 Merc 150 Saltwater Optimax, I rarely get to use my boat, but when I do it seems there's always issues. The other day I tried to take it out and it would idle fine for about a half mile out to the channel. When I went full throttle to get up on plane, the motor began to stall, choke down and lose power back down to idle. It could never get on plane. I idled it back to the ramp and it died a couple of times on the way. It typically would crank back up, but the last time it didn't and I had to come back under troll motor power.
    I got it back to the house, pulled fuel filters under cowling and on transom, dumped them, ran it clean and dumped them again. Did this for a couple of times. When I was running it in a barrel filled with water at the house I noticed that when I would go to full throttle I could hear an alarm. It would get louder with the more RPM's from the throttle and would die out after a couple of seconds when I throttled it back. I'm pretty sure this could be a overheat issue, but I just changed the water pump and propeller last year and haven't ran the boat more than twice after that. I also replaced the thermostats last year as well. Any ideas to where to look next or to check back over what I've already done. I wouldn't think that the water impellor or thermostats would go out that quick, but I'm no expert.