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

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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.
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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.
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.
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