Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for the following conditions:

The throttle blade for damage.
A skewed cam sensor signal. Inspect for signals that are intermittently shorted to ground, causing a fluctuating RPM on the scan tool.

If the condition is intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.