There is a vacuum leak at this area that I am trying to track down. I took the electrical connector and the hose off to better see what was here. If I spray cleaner near the clamp that holds the hose to the oil filler, I get a huge jump in idle speed. What is the sensor that is here? Do I need to replace the whole assembly from the MAF to the Throttle body? I believe this is the Engine Air Intake Hose 1C0-129-684, How do I determine if I have the Cold Weather Package? This was discovered trying to fix a P0506 idle air control CEL.