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Diagnostic Aids

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 (4.3L VIN W & X) .
For an intermittent condition, go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - TRUCKS article.