Section 199 (Engine Controls - Tests W/Codes - 2.3L): Summary
WARNING: This page is about a different car, the 1996 Ford Ranger. 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 the TESTS W/O CODES - 2.3L article for symptom diagnosis or intermittent diagnostic procedures.