Diagnostic Aids
WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
A restricted fuel system may provide adequate fuel supply at idle, but not during acceleration. Water or alcohol in fuel may cause low HO2S voltage during acceleration. Check for defective or plugged fuel injectors or fuel pump. Check for low fuel.