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My cobalt exhibits this float, now that I think about it. I think it's poor mans rev-matching. If you leave it in neutral, but your coasting down a hill on the highway, it'll turn over at about 1700 RPM. But it idles at under 1000 if it's stopped. When you go to change gears, it dosen't fall flat on its face as soon as you take your foot off the gas. Instead it'll slowly fall, and it gives you time to get the next gear in, and take your foot off the clutch. Makes for smoother shifting, and less clutch wear.
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