coupe idling high

I have a 96 civic coupe. Its idling around 2 grand. Im trying to figure out what would make it idle high? Im new to hondas so I need some ideas. Thanks. =)


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Could very be a vacuum leak. Any CEL's? Has the car recently been worked on that may have caused this? How many miles?
the body has 240,000 but the motor was just replaced with a single cam. i was thinking the timing might be out a tooth or two or vacuum leak but other than that i had no idea. I think it is throwing a code for a o2 sensor but thats it that i know of.

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