Mercruiser Alarm

3 times now on Random occasions I get the dash solid warning alarm
First time it gave 2 beeps than alarm and then it started to run rough. Shut it off. Checked it over. All was fine. Started it up no problem. 2 weeks later about 20 mins in solid alarm. Pulled throttle back and started running rough again. Stumbling. Check it over. All levels ok. Nothing hot on the gauges Started it up. No problems again.
Drove back in about 30 mins no issues.

Gear oil , engine oil levels are good. Coolant sender is new and I know it’s accurate. Temp runs at 160-170. Thermostat is brand new.

I don’t really want to spend $600 for a mercruiser scanner but I might have to I guess.
 
Interesting. No idea, you've checked all the things I'd think of. Very interested in what ends up being the issue. Please keep us posted. Thanks.
 
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