Diagnostic Aids
WARNING: This page is about a different car, the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Amigo, and 2000 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
Test system grounds. Check injector. See INJECTOR COIL TEST in SYSTEM & COMPONENT TESTING article. Check spark plugs for cracked insulator, carbon tracking, incorrect gap and wear. Check ignition coil for cracks or damage. Substitute a known-good ignition coil.