2003 DF140 vibration issue

[ferryhouse]

Hi guys.
I have twin 2003 DF 140's. I got the boat in the spring.the port engine vibrates the whole boat.The engine does not shake it is more of a vibration.Any thoughts on this issue?
Thanks

[artdf175]

A little more information ?
When is this occurring ? Idle?
Certain RPM ranges ?
Art