My 2009 Kia Sportage 2.0 litre engine is surging at cold start up on 2009 Kia Sportage

My 2009 Kia Sportage 2.0 litre engine is surging at cold start up, it revs up and down for about 30 seconds. Once in gear this stops. I took it to dealership for oil change and reported surging and was told it there was a code for emissions switch. When I took it back for the repair they were not able to duplicate the problem, so I can only assume they did not change the switch, but have not been able to get a black and white answer. It continues to surge on cold start up. I ran across a forum where others have experienced this surging but their inquiry was unanswered, curious as to your thoughts.

by in Vidor, TX on December 31, 2012
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1 answer 2 comments
ANSWER by , December 31, 2012
it sounds like an idle air control problem
COMMENT by , December 31, 2012
Could be, I found another blog with same conclusion, "idle speed control air-bypass & throttle valve" gunk build-up over time. Thank you for your comment.
COMMENT by , March 17, 2013
Replaced mine with a new one a few weeks ago Did not make one bit of difference to cure the problem ????? If you know the fix, please contact me at auburn386@yahoo.com Thanks Jay in ARK.