Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

A restricted fuel filter can supply adequate amounts of fuel at idle, but may not be able to supply enough fuel during heavy acceleration. Water or alcohol in the fuel may cause low HO2S 1 voltage during acceleration.
High resistance in the ignition coil control circuits may cause this condition.
MAP sensor-High resistance in the MAP sensor circuits may cause this condition.
Inspect for faulty or plugged fuel injectors.