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I was reviewing posts that I had made. This was from a LONG time ago, but I wanted to finish it off just in case it may help someone else with a similar problem. Turns out there was work done to the CIS by the PO and the WRONG CSV flange (part # 911.110.264.00, at the Cold Start Valve) was installed. A $10 item that comes in two versions (one open and the other closed). The closed one was installed and prevented throttle-circumvented air from the AAR to enter the lower intake manifold. At first, I overlooked it thinking that the initial "puff" of air from the AAV was needed ABSOLUTELY so the cold engine would start. But that turned out not to be true. There's enough air gap around the throttle plate to allow cold combustion and so the engine wasn't depending upon AAV stored air to assist startup. Once the new correct flange was installed, cold fast idle was good (around 1800rpm @ 35*F, maybe a tad high, but I did open the AAR up further in my earlier diagnostic path). Thanks for the help and contributions from everyone that ironed out my thinking and pointed me in the right direction! JP
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