2004 Subaru Outback Idling is goofy

2004 SUBARU OUTBACK
123,000 MILES • 4 CYL • AWD • AUTOMATIC
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N8BOXER
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When I first start the car my rpms shoot up to nearly 2000 and then drop to 1500. I realize it may take a little to warm up but this also happens when I stop at lights and signs. There has been some vibrations but I'm replacing a motor mount on the drivers side, butthe rpms still stay pretty high for just idling. Im not sure what this is but i'd like to fix this issue. If u have any ideas, I would be very greatful
May 10, 2010 at 8:46 AM
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LEGITIMATE007
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I suspect a bad or dirty idle air control valve , I would first try to clean it and the throttlebody. and see how it goes, sometimes it just has a buildup of carbon.
May 10, 2010 at 9:27 AM
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LEGITIMATE007
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https://www.2carpros.com/how_to/how_to_tune_up.htm
May 10, 2010 at 9:28 AM
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LEGITIMATE007
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is there a check engine light on?
May 10, 2010 at 9:29 AM
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N8BOXER
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No. The engine light isn't on. For about a week it was on and that was about a month ago but it went off itself.. Another guy told me an auto switch or auto valve or something might be dirty but I have no idea what that is. Any chance u guys know what it's supposed to idle around for rpms? And thank u I really appreciate your help :)
May 10, 2010 at 9:38 AM
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LEGITIMATE007
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yeah thats just what I mentioned, the idle air control valve and throttlebody is probably dirty with carbon. I sent you a link that shows you how to clean the throttlebody, the idle air control valve is part of that , so it just self explainatory
May 10, 2010 at 11:07 AM