Glad the site is back, but my old posts on this topic seem to be lost. The problem was a rough engine, misses, shaking on cold start any time of year. All kinds of fixes were offered. I noticed that the rpm at startup never seemed to get as high as my two other cars of various makes. With 90K miles, I wondered what would prevent the startup rpm from rising into the mid teens and also cause rough running. Guessing that the ECM is pumping a rich mixture through the injectors for the start, I figured the idle air control must have to open up more for the start than for any other cause-like A/C or elecrical demand. Maybe the valve was binding at higher openings. So, knowing I would break a few of the nearby vacuum tubing, I got a foot of silicon model airplane fuel line from my shop and proceded to remove the IAS motor and clean it out. A half teaspoon of carbon grit came out until it was clean. Reassembled, patched the vac lines, and started it up at initial 1600 rpm idling down to a smooth 600 rpm no skips!! fixed! I thank you all once again for the background info leading me to this fix. Happy Holidays! PS I wonder where all the carbon came from--its supposed to be filtered intake air!