It is controlled by a solenoid and it is located in the driver's D pillar(rear most). Pull the trim inside the tailgate on the left side and the solenoid is mounted in the rear against the face that the tail light is mounted to. I pulled both tubes (in and out) and with the car running I determined which was which and plugged the vacuum source line. My idle seems to have improved, but it may be a while for the control circuit to readjust. We'll see.
AceEngineer
