Idle revving from 1k to 2k rpm at startup

[ArticBoxster]

[QUOTE=ArticBoxster;394996]Hello Everyone,
I was hoping to get help with my idle issue. At cold start my engine would rev non stop on it's own. I had replaced the MAF twice from Pelican parts (didn't help). I cleaned out the throttle (didn't help). I'm thinking it's the idle control valve, but did not want to waste money before I check with on here just incase someone had the same experience and if you was able to resolve it. I was told by a mechanic (not from Porsche) that it's the brain of the care itself that needs to be replaced. Is this correct? I have no error codes. And if so does anyone know the cost and if DIY is possible? Also I don't have any error codes. Thanks

[Jamesp]

Mine revs to between 1 and 2 k momentarily on start up then drops back to 850 idle. My manual mustang does the same thing. I think that's normal. How long does your Idle stay increased? What year / model do you have? Standard or auto? That information may help folks with your question.