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OK, thanks for the clarification. Until the knock sensor is replaced I don't think you will have much success with the idle calibration, but you should be able to find the cause of the high idle. When you say the O2 sensor reading was fluctuating do you mean it was alternating between rich/lean quickly? If so this is the correct behavior but was the engine speed also hunting while this was occurring? (please excuse me, I am having trouble parsing exactly what is meant by some of your original descriptions.) It seems like you have done quite a bit of troubleshooting so this may have simply been too basic for you to mention, but have you checked for any vac. leaks? If there aren't any vacuum leaks you could try disconnecting the FICD solenoid and AAC valve, this should cause idle to drop. If it doesn't drop to below 800 I would try backing off the throttle stop screw until the idle is around 700, then plug the IACV back in. Best regards,
-JM
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