Preliminary Inspection

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

Verify on-board diagnostics are working by performing DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in SELF-DIAGNOSTICS - 4.3L SIERRA & SILVERADO article.
Ensure PCM and MIL functions properly.
Ensure no DTCs (except intermittent) are stored.
Ensure fuel control system operates properly. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4.3L SIERRA & SILVERADO article.
Perform fuel system pressure test.
Visually inspect all systems.

After all checks have been performed, verify customer complaint and locate correct symptom. Check items indicated under that symptom. See SYMPTOMS .