I have followed the vacuum hose diagrams and all appears well except on the right fender (passenger side) there is a single vacuum hose connection and I have no idea what plugs into it. It does not show on the EGR diagrams and it is around a number of other hoses kind of tucked up under against the fender wall. It is easy to see if you stand by the wheel and with the hood open look behind the fuse boxes. It is the right most vacuum hose connection. Any thoughts would be appreciated.