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The first thing you should do, if you are considering buying a used 86, is unplug the negative battery cable and let it sit for 20 minutes. Plug the cable back in and then let the engine idle for 2 minutes without touching the throttle. Turn it off, then restart. If it still idles rough, then you have real issues; fuel delivery, spark plugs fowled, even a clogged PVC valve. It could take some time to deduce the real cause, you just have to determine if it's worth it in the end.
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