WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pinpoint Test P: Intermittent Problem Diagnosis Chart (P1 & P2)
Courtesy of FORD MOTOR CO.
Fig 2: Pinpoint Test P: Intermittent Problem Diagnosis Chart (P2 Cont. - P4)