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Q:

rough idle on 1992 Cadillac DeVille

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
no codes idles rough for 10 min. then clears up
(2) Answers
I agree it does sound like you may have clogged injector(s) try using a fuel system cleaner & some good octane gas and see how it acts.