high idle on 2002 subaru?

transcend312

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I have a 2002 subaru outback with a v6 engine. it has 112000 or so miles on it. when i start the car in the morning, it idles at 2000+ rpms; the needle moves up and down as if the engine is revving. once the car is warm, it idles below 1000. is this a problem?
also, when i drive 60-70 mph, there is a loud noise and vibration.
any help is greatly appreciated.
thanks!
 
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