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Both of my late model vehicles do this; the fuel injected vehicles have a variation of a idle speed motor/ idle speed control valve/ many different names. What they do is adjust the idle. Many times they can cause a slight lean condition which manifests itself as a slight rough idle. I would not worry about it and don't throw dollar bills at it.

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Q: Is it normal for a 2004 Dodge Grand caravan to have a very slight vibration when idling at a stop sign the check engine light is not on?
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