rough idle on 1992 Cadillac DeVille

no codes idles rough for 10 min. then clears up

Asked by for the 1992 Cadillac DeVille
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.
1 more answer
no codes available for this in OBD1. from your description, it sounds like clogged injectors.