Why dont you just go in and set the idle back down to 850 and see how it sounds. Its a simple button click to bring it back up if its unhappy.
Aside from that I would look for a vacuum leak.
Are we talking about hot idle or cold idle?
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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