I have two ports on a mikrotik port 1 has vlan 1 vlan 2 and vlan 3 coming into it.

Vlan 1 is management
vlan 2 needs to be untagged on port 2
vlan 3 needs to pass through port 2

I have vlan 2 on interface1 then bridged with port 2 and that works great

The problem is I can not figure out how to also pass vlan 3 through.

I tried making 2 vlan3's and having one interface be port 1 and the other be port 2 and bridging the two vlan interfaces together. Didnt work.

Any help would be awesome.

I would recommend using a switch for this instead - something like the HP ProCurve Switch 1800 8 port is cheap and will do this fine.

I am currently using a switch but i wanted to use a mikrotik for diagnostic and speed-test purposes.

Upgrading to 6.0 made it work!