3.4L (Impala & Monte Carlo) & 3.8L (Grand Prix, Impala, Monte Carlo & Regal)
WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, 2003 Saturn L200, and 2003 Saturn Ion 3. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition ON, then OFF. Turn ignition ON for 10 seconds, then OFF for 5 seconds. Start and operate engine until normal operating temperature is reached. PCM will now properly control idle speed.