Hi Jeremy, The CO screw is used to compensate for minor deviations from "normal". Minor fuel pressure variation causing injector flow rate changes and unmetered air leaks can be compensated with the CO screw. Install the new AFM and if no idle quality changes occur, the rest of the engine systems are functioning normally. Ideally the exhaust gas content should be checked with an exhaust gas analyser before & after the AFM installation but idle quality is an inexpensive alternative. Regards, John
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