GM Repair Problems? Ask GM Repair Expert Now.
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The first thing I would do is remove the air inlet tubing from the throttle body and take a shop rag with brake or carburetor cleaner sprayed on the rag and wipe out the throttle body bore and bore plate cocking open the throttle plate in the throttle body to wipe the carbon out.This causes a low idle issue which can lead to a stall out and dimming lights as well as the charge or battery light coming on as the idle drops.
If this does not resolve the issue here I would check and clean the battery connections as well as have the battery checked/tested to see if it needs replaced and the alternator.A local parts store can test the battery and alternator at no charge to you and usually in less then 10 minutes time.
These are the most common causes for this type of fault here.
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If the idle is low this can make the engine vibrate and low idle is most commonly caused by the carbon build up in the throttle body needing cleaned out or low voltage due to battery cable connection issues or the battery or alternator at fault.
If your check engine light has come on with this issue at all here the first thing that needs done is to have the fault codes read out/checked then diagnosed and repaired.A local parts store like Auto Zone will read out the codes at no charge to you.
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O.k.,this does sound more like the carbon build up issue in the throttle body then.I suspect it just needs cleaned with a shop rag with carburetor or brake cleaner sprayed on the rag.I have run into this several times before and had to clean it.I have to head out for about an hour but will be back soon if you need anything else.