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Q:

When it's idling,it skips,but never stalls. driving it runs great.whats wrong? on 2003 Cadillac Seville SLS

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It runs great unless it has to sit and idle, then it skips but never stalls out.
(2) Answers
(2) Comments
You probably have a misfire condition due to a faulty spark plug or spark plug coil. Need to get code read and post result here to further assist. Autozone provides this for free.
I got the same problem with my 98 Seville with 67k original.
Thought maybe I got some bad gas. The idle skips at stoplight
and the takeoff from light seems to be sluggish. No code coming up.
maybe there is a misfire, is the check engine light on?
Yes the engine light is on, stay's on and once in awhile flashes.