Diagnostic Aids
WARNING: This page is about a different car, the 1997 GMC Savana, 1997 Chevrolet Chevy Van, and 1997 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Visually inspect vacuum hoses. Check throttle body for possible cracked, broken or plugged vacuum block. Check engine for possible mechanical problem.