5.7L (Camaro, Corvette & Firebird - Automatic Transmission)

Turn ignition off. Reconnect PCM battery feed. Turn off all accessories. Set parking brake and block drive wheels. Start engine and run until coolant temperature is more than 176°F (80°C). Put transmission in Drive. Allow engine to idle for 5 minutes. Put transmission in Park. Allow engine to idle for another 5 minutes. Turn engine off for 30 seconds. PCM will now properly control idle speed.