Based on the location you describe, the component you refer to is the rotary idle control valve. It controls the idle speed by the current from the ECU. Air is drawn through it from the rubber plenum connecting the airflow meter to the throttle body, and thence into the intake at the idle air distributor port. There is a 'Y' in the plumbing at this point where the hose runs parallel to the valve cover, branching into the breather hose connecting the valve cover to the air cleaner. At this junction is the pcv device. From the outside it just appears to be a plastic hose connector with an additional small port going to the back of the fuel pressure regulator. If fact, it has a flow restricting orifice, and the third port connects to the 'breather' side. Almost nothing can fail with this device.