Low At Idle In All Ranges
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 Mercury Grand Marquis, 2002 Lincoln Town Car, 2002 Ford Crown Victoria, 2001 Mercury Mountaineer, and 2001 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Low fluid level, restricted inlet filter or damaged filter inlet seal, loose valve body bolts, damaged gaskets or separator plate, pump leakage, case leakage, faulty valve body, excessively low engine idle or main regulator valve sticking.