You might find this worth a read: https://www.yachtforums.com/threads/troubleshooting-running-gear-vibration.34088/
Might also want to give us some information. You ll find many smart guys here (and gals... and maybe in between...) but you don’t even bother mentioning the year and model of the boat!! also... did it just start? How long have you had the boat? Which side is vibrating ? Which engines do you have? first think is to go for a swim and make sure nothing is wrapped around the prop. A few days ago I picked up slight vibration on the 2009 84’ that I run. Very slight but there nevertheless. Turned out to be some kind of plastic canvas piece around the wheel
That last thread was pretty comprehensive and should give the OP what he needs to zero in on his issue. No need to rehash in a new thread unless he has more questions after reading that.
Motors moving on the mounts? Coupling wobbly? Vibration over the props felt on deck only? Underwater exhaust? And yes has it just started or ongoing issue?