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Repair guides and support for the 5th generation Honda Civic, first released in late 1991.

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Why does my engine rev sometimes when idling?

When my foot isn't on the gas and the car is not in gear (it has a manual transmission), the engine will do short revs every 1 or 2 seconds. Any idea what this could be? The car also has a blown head gasket. Could that have been the problem? It's in the shop right now getting repaired for that, so we'll see if the problem goes away after we fix that.

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The head gasket is most likely the problem, this can cause poor compression, hence the reving

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I know this was from almost a year ago, but I figured I'd add that we got the head gasket replaced and it fixed the problem. Thanks!

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It also could be your IACV or your FITV

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Sterling Hirsh will be eternally grateful.
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