Diagnostic Aids

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

Check following:

Check PCM and system grounds. Ensure that all grounds are clean and secure.
Check fuel injectors. Perform FUEL INJECTOR BALANCE TEST under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article.
Check spark plugs. Check insulators for cracks, carbon tracking or other damage. If a problem is found, replace faulty spark plug(s).
Check ignition coil(s). Check for cracks or carbon tracking. If a problem is found, replace faulty ignition coil.
Substitute a known-good ignition coil, or swap ignition coils cylinder-to-cylinder. If misfire follows coil, replace suspect coil.