EGR Valve
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, and 1995 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
EGR valve is a vacuum-operated EGR. EGR flow is monitored by EGR Valve Position (EVP) sensor. The EGR valve is operated by a vacuum signal from EGR electronic vacuum regulator solenoid.