1998-2002 Camaro Firebird Idle Learn Procedure.

Anytime the Power-Train Control Module (PCM) or battery is disconnected, or the PCM looses power, the PCM‘s learn position of the Idle Air Control valve (IAC) pintle is lost.
The engine idle is unstable when the IAC pintle position is lost.
Perform the following procedures in order to return the IAC valve pintle to the correct position.

1. Turn off the ignition. 
2. Restore the PCM battery feed.
3. Turn off the AC controls.
4. Set the parking break and block the driveway wheels.
5. Start the engine.
6. Shift the transmission selector into the drive range.
7. Allow the engine to idle for 10 minutes.
8. Turn on the AC controls.
9. Allow the engine idle for 10 minutes.
10. Shift the transmission selector into the park range.
11. Allow the engine to idle for 10 minutes.
12. Turn off the AC controls.
13. Allow the engine to idle for 10 minutes.
14. Turn off the engine for 30 seconds.