Sounds like either a bad IAC or dirty MAP sensor. Clean the air sensor and try again. It could also be the ECU going bad. If the idle keeps changing after you adjust it, then the ECU may be resetting itself after a few hours. If there are any other random electrical glitches in the car, that may confirm the ECU.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield
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