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JP
Unfortunately CIS cannot compensate for the drop in compression and manifold vacuum that comes with wear and if it is below spec, you are left with finding a compromise. A low cold idle usually means a lean mixture, vacuum leaks or not enough timing. My advice would be to do a compression test if you haven't already. Then I would check for vacuum leaks at the injectors, boots and throttle shaft with an unlit propane torch. There are too many variable involved to diagnose vacuum leaks with a gauge reading. If you can wiggle the injectors, the sleeve Orings are usually leaking. Any drop in vacuum, from leaks or a tired engine, results in less air flow meter deflection and improper fueling, especially at cold idle. After you fix the leaks, my advice would be to try a little more initial timing for several cold starts, then a little richer setting. My experience is the Bosch normal spark plugs give the best cold start performance. Unfortunately you only get one attempt at a cold start a day and finding the right compromise takes effort.
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Paul
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