I don't remember the idle speed going up when the hot idle compensator opens. But, that's the most likely cause of the increased idle rpm and the whistle.
Let me know how it works out.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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