There are a lot of expensive variables in this equation. The merc manual has some very good instructions to troubleshooting. But, before i run down the electronic rabbit hole, i would Try running it on a seperate fuel source. Fuel pump could do as u describe also. When it stalls , is primer bulb full or collapsed?
The tach issue is a good indicator, but might be seperate issue.
Not trying to muddy the water, but there are a still a few unknowns. U know your boat better than anybody, its just as important to find out what its not as what it is.
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