How do you replace the ignition switch in a 1988 Chevy Corsica automatic with tilt and cruise after you have pulled the steering wheel?

I have a 1993 Corsica and yours is probably similar. Disconnect the battery. Why? Airbag explosion! After you remove the Airbag if equipped (usually 4 bolts located on the back of the steering wheel holds it on) Look at the steering shaft for a E clip. It is a clip that sets around the shaft and has two holes in it. It takes a special E Clip removal tool. After this you can remove the metal ring that keeps the shaft from turning when switch is turned off. The switch assembly is held in with a star hear screw. Some are hidden behind a key alarm switch. Mine was white and it just pulls out. When you pull it out you will see the retaining screw hidden behind it. After this you can pull the key cam out.