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As does putting the car in gear as well as temperature. Again, unless I could actually get in the car, I'd never be able to discern what "rough idle" means, it's probably too hard to describe effectively. Many engines these days are designed with piston sleeves that wear themselves in and can lead to some slight erratic idles (the Chrysler engines are good examples).

well in Chrysler Idle speed is automatically controlled by the computer. If idle speed is not correct, the car has a vacuum leak or a sensor problem.

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