Ok, so have been working away on an "S" model for my daughter. Finally got it back together after and automatic transmission replacement. Did my own work. The car ran ok before I took it apart. Its time to start the car after all this work. But, I have come across a small issue. I seem to have an open port on the intake manifold and I don't know if there was something plugged into this port (don't find any unplugged hose), is it blocked off internally, or do I leave it open? My first thought it to put rubber cap over it to start the car. Better than a big intake leak. In the picture these are the 3 ports I am talking about. One goes to the valve cover, another to what I will call the purge air solenoid and the other is open. Any suggestions?

 

I'm pretty sure it's supposed to be open --- no hose connection. My '07MCS is also this configuration.

 

Found out that this port is use for emission outside the United States (Thanks ECS Tuning). Its internally blocked.

 

Welcome.