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Hey guys looking for some help here. I just changed my alternator today and after hooking the battery back up and starting it , it now idles at 3,000 rpm. Any ideas what I might have unplugged or whatever to cause this?
 

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Use a code reader to see if there is a lean condition (vacuum leak) or a voltage out of parameter condition. No matter what, error codes ought to give you a clue on where to look.

For sure, disconnect the battery, turn on headlights for a few seconds, reconnect. See if idle still high and then check for error codes.
 
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