u/Impossible_Manner164

I have a 2016 Chevy Trax. 1.4L ECO turbo engine.. No one can determine why its idling rough, shuddering while in drive with the brake on and sometimes while reversing. I have replaced the fuel pump, purge valve, the PCV valve cover, spark plugs, and coil pack. Tonight I discovered this port. From what I've read its supposed to be capped off since it's not used but IF its not capped can cause the issues I'm having. As you can see it looks like there is no cap but is this something that is capped where you can't see? Can anyone please give me some insight before I loose my MIND?!