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If there is a click accompanying a drop or rise of revs that usually would indicate some load (like A/C pump) going in and out, causing a subtle (but noticeable?) change in revs. Maybe you don't have a software problem so much as a climate control problem. If your system is in Auto mode, it will mix in air from the A/C pump even if it isn't hot outside, for purposes of defrost and to keep the pump lubed and free of odor.
I know that's an awfully simple explanation, but try to idle with your climate control in all off...see if the problem remains. -Good luck.
 
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