Section 39 (Engine Controls - Trouble Shooting - No Codes - 4.3L): INTERMITTENTS: Notes
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Intermittent is a DTC or symptom, with a condition that cannot be duplicated.