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

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