Sounds like a bad ignition switch. My 88 T-Bird's melted inside (common problem on 80s Fords, there was a recall but the updated switches are still crap) and did weird stuff like that. I'm not sure about GMs, but on most Fords, the lock cylinder turns a gear which moves a rod that actuates the switch, which is under the steering column. Took about 10 minutes to change mine and the new part cost $15.
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