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Idle air control valve would be my guess. It's just a guess. I had a car that would do that until it was warm. Sounds like the car isn't fast-idling when cold.
Of course you should do all tune-up stuff, and replace any old or cracked vacuum lines. That stuff improved my idle a lot.
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1992 SE-R 'Fasty' Mods and mods in boxes. Ready for more boost, or more vvl.
"We have always known that heedless self-interest was bad morals; we know now that it is bad economics" F.D.R. Second inaugural.
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