I found on the back side of the plenum on my 95 nissan pathfinder XE 4wd that there is what appears to be a vaccum line missing. when you plug it off with your finder the idle slows a little bit. I do not know where the line goes to and what it will affect. is it something important and would this affect anything on the motor or gas mileage or anything? i have a pic included (i did not take the pic but have an arrow pointing to what im talking about)