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I wouldn't worry about the long.time to get the wcp in spec. I found the same.thing when performing this test on battery power and low ambient temperature. When I repeated the test with the engine running the WCP got into spec in about 3 minutes.
I would follow Schulisco's advice on checking the idle screw, and if you haven't already done so, get set up to do a vacuum leak test. There are multiple threads on how to do this, but let us know if you need a link. I wouldn't adjust anything until you confirm no vacuum leaks.
John
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