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I agree with RarlyL8. I've had some experience in this area. My SC had the fluctuating idle that went away when the lambda sensor was unplugged. After investigating, I found that the CIS basic mixture was set too lean. The fluctuation comes from the frequency valve making frequent adjustments that causes the idle speed to fluctuate as well. If you reset the basic mixture to be slightly rich, (45% duty cycle or so), the fluctuating idle will go away and you can plug the lambda sensor back in. The car now idles rock-solid at 900 rpm.
Greg
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