Car runs good until it sits and idles...

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worked for me

I had the same problem, it's pretty ez to fix. All you need is some engine degreaser and lots of q-tips. Take your IAC off, its only 2 bolts. It's the cylinder shaped thing on the front of your EGR spacer. It has one plug in the bottom of it. Take the 2 bolts out, unplug, then there are 2 flat head screws that hold the piece together. Be easy not to strip them. All ya do is spay in some degreaser, let her sit for a few then start cleaning with q-tips. Repeat as needed. I did this and my car idles great now. Hope it helps out.