on cold start up car has very high idle and vibration please tell me why

2002 KIA OPTIMA
120,000 MILES
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BRENTE228
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  • 7 POSTS
When this car is cold on start up idle is very high and has vibration after warm up its not as bad
Jan 28, 2012 at 5:02 PM
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FIXITMR
  • CAR REPAIR CONTRIBUTOR
  • 9,990 POSTS
could be symptoms of vacuum leak. idle is determined by how much air enters intake passage. more air higher idle. idle is computer controlled by idle air valve. excess air entering thru leak can raise idle/ cause rough running. also check each cylinder for proper fuel/spark and spark plug condition and compression value.
Jan 28, 2012 at 5:41 PM
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BRENTE228
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  • 7 POSTS
Thank you very much
Jan 28, 2012 at 5:45 PM