I'm getting ready to order and replace my throttle body. I'm getting codes 2B5C and P115c. I smoke tested going towards the throttle body from that rubber hose that connects the the plastic tube, and then tested going the other way towards the intercooler. couldnt find any leaks, although the system wasn't pressurized much. I noticed this hole today on the intake manifold below it. is something suppose to be connected to it? for reference the vacuum tube that goes to the top left corner of the valve cover is connected next to this hole.

 

nope...totally normal and it is plugged anyway