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There can be a few reasons, mostly to do with the ignition. Possibly a plug is not firing, possibly one or two plug leads have been swapped inadvertently, possibly a valve is sticking.

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Q: Why car vibrates at idle speed?
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Related questions

How to Set idle speed on a Chrysler sebring 1999?

Idle speed is not adjustable on this car.


Can a bad battery cause a car to idle high?

No, that has nothing to do with idle speed.


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Why would a cars back end vibrate at idle?

That doesn't make any sense. But if your car vibrates at idle and stand still, then you probably have a fuel delivery or ignition problem that is causing a misfire.


What is the correct idle speed while the car is in drive?

Hey Jonathan==It varries between cars. If your car is later than about 1986 it is computer controled and you cannot change it. Sometimes if the idle speed solonoid is bad or dirty, the idle will be wrong. Goodluck, Joe A vacuum leak will also cause idle quality issues.


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