Why won't this car start... sometimes?

after i thought about this for a while,its been several years since my ignition switch was replaced.if i remember correctly,it was the same problem you are having.i had a guy do this for me,and he said i had some wires pinched.it corrected my problem,and i think i still have the old switch,even though the car,i sold it,later on to a co-worker.pushrod will be getting in here soon,hopefully he and some others will chime in on this.your switch is over $200.00 for your car.dont throw anything at it yet.

Might have to do with GM key passcode....I believe you have a chip in your key....the onboard module can fail....just looked at a Riv this weekend...same issue....no start, wait a couple miutes starts right up....have seen similar postings for same era Buicks and other GMs. Personally have not experienced the problem to resolve it but apparently it's not so uncommon.