Diagnostic Aids

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This increase should be from 21-39 g/s at idle to greater than 380 g/s at the time of the 1-2 shift.
For an intermittent problem, visually and physically inspect the exhaust gas recirculation (EGR) valve for a possible binding or sticking in the open position.
Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .