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I didn't read about replacing the PCV valve (on the end of the elbow you replaced) or replacing / cleaning your IAC valve? Could be a vacuum leak, but on my 00 duratec spraying throttle body cleaner into the intake opening where the IAC valve mounts seemed to be the cure for the erratic cold idle problem. Try spraying the existing IAC valve and the opening (librally), re-install and let sit overnight as a first step.
 
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