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All Mercuisers are cataloged by serial number, do you happen to have your serial number so I can run it and see exactly what you have? If not, is the engine carbureted, EFI, or MPI? Approximately what year is it?
Do you know what an engine misfire is? Is you do, is the engine misfiring? Or is it running smoothly but just shaking?
Many things can cause a misfire so let me ask you some more questions.
1. Has the engine been compression tested yet, if yes, what are the numbers?
2. When was the last time the engine had a full and complete tune up? This would include ignition components such as changing the cap, rotor, plugs, plug wires along with all of the fuel filters
3. Has the engine been hooked up to a separate fuel source in order to rule out any kind of bad gas issue?
4. Has the engine been hooked up to a scan tool?
Yes of course, there are no time limits here. Aside from the compression do you know the answers to my 2nd 3rd and 4th questions?
You said Sandy. Is there a story to this engine, have you ever personal seen it run without this vibration? Did this engine sink at any point, or get water at least 1/2 way up the block?