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1991 964 C2-low idle when warming up revisited

Engine

Vehicle Information: Year: 1991; Body Type: Targa; Engine (type, size, modifications): stock; Total Mileage: 77K;

Back in October, under the same title, you said that there are many possible reasons for the lack of an increased cold idle on cold days. Soooo, since then, I gave the car a tune up, installed-new plugs, oil/air/fuel filters/O2 sensor, did a valve adjust, checked and tightened all intake and vacuum hoses, checked distributor operation, spark plug lines, proper operation of cylinder head temp. sensor, and idle control valve, and still no increased cold idle on cold days. Seems to run well and idle fine under all other conditions. Any thing I missed or any thoughts? Thanks for your help!

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