Section 10 (Engine Controls - Tests W/Codes - 4.2L): Summary
WARNING: This page is about a different car, the 1998 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
If no diagnostic trouble code is present but driveability problem still exists, proceed to TESTS W/O CODES - GASOLINE article for symptom diagnosis or intermittent diagnostic procedures.