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Mine has always had a rough idle. I didn't really notice it until I had a young college student ask me if there was something amiss. I just figured he had never been near a high performance engine before.
Bill
mine idles between 5 and 600 rpm.after i removed the cats i can really feel the stock cam.it seems like a rough idle but these engines are high performance and after you add a few mods,vettes will really shake. :yesnod: