Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Monitoring Fuel Injector circuit status with scan tool, while moving fuel injector harness, may help isolate an intermittent condition.
Performing fuel injector coil test may help isolate an intermittent condition. See FUEL INJECTOR COIL TEST .
For an intermittent condition, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L SONOMA & S10 PICKUP article.