EGR Vacuum Regulator (EVR) Solenoid
WARNING: This page is about a different car, the 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
EVR solenoid controls vacuum output to EGR valve. When EVR solenoid is de-energized, solenoid valve opens, allowing manifold vacuum to be applied to EGR valve. When solenoid valve is energized, solenoid valve is closed and vacuum is vented to atmosphere.