2006 150 Optimax Vibration

[lvmeatman]

I just purchased a 2006 150 Optimax with a Crestliner Sportfish 1850. The motor has 48 hours on it.It starts and runs great but when I put it in gear there's a very noticable low level through the hull vibration.I can feel it through the decking.It does this in forward or reverse.When I raise the rpm's up a little bit it stops.Is this a rigging or prop problem?Any suggestions would be appreciated.
Thank you