If a mechanic looked at the car he would have noticed the errors for o2 sensors and the car would not run correct when started that is why they must be pre-heats the car would run like crap at low and cold rpms but run great at high and warm rpms. If I was to guess without even looking at it I would say you have a timed vacuum switch gone bad leaking at warm up and the one that is bad is one that is closed at cold start up. That would lead to the idle circuit and the EGR circuits.
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