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The idle behavior you describe is exactly what you would find if there were more air flowing at idle than needed to maintain the preset rpms. At first it will be higher, then after several seconds, the computer will drop it to around 700 or so (less fuel, I think).

I'd look for air getting in through a bad seal or a Idle Air Controller (bypass) that is sticking open. Either one could also cause the whistle.

If the throttle plate is not closing all the way at idle, it might cause the idle problem, but I can't see it causing the whistle. Adjust the screw so that the plate just closes as the cable goes to idle.
 
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