Posted before but had no replies. My port side engine has a vibration from around 1800-2400 rpm. Doesnt matter if it's in Neutral or in gear. Currently doing exhaust and steering upgrades so I will pull the drive if necessary. 350 mags and bravo 1's in a 02 Formula 292 fastech. What should I look for??? Any advice is welcome, thank you!!!

U Joints

^ agreed, below is the order I would check based on your description

Ujoints, coupling, engine alignment, engine misfire/dead cylinder (normally worst at idle)

soft transom also

boat was recently surveyed and the transom was dry.

Upon further inspection, I found the gimbal rings are shot. Boat is going to a marina to be repaired. I simply dont have the time or knowledge to take on this project myself. Thanks everyone for the replies.

Gimble bearing? Worse when the drive is trimmed up?

I agree the gimble RING wont make it vibrate.

Is the vibration accompanied by a knocking sound? If so, could be a head gasket.

I understand that the ring wont make it vibrate but it's not something I'm not gonna bother with since I'm taking it in. And yes I will get everything in writing, learned that lesson a few years ago.