Stuck Keys are a widespread problem in many GM products of that era.
There are several failures that can cause it from the Brake Pedal Switch, Console Shifter Button, Solenoid in the Shifter & the Solenoid in the Steering Column that releases the key once the vehicle is in Park. If they don't all communicate, the key will not rotate all the way to OFF & remains captured. Often it is broken wires at a connector at the base of the Shifter inside the console, but that is not the case with mine.
With all of the troubleshooting that they did, it now seems to be working; however, I don't believe that it will be permanent. One workaround is to depress the plunger in the 'secret' access hole under the steering column that manually activates the Solenoid thus releasing the key.
I really loath these kinds of problems...
TAM
