I have heard a similar whistle sound (not on my Dak) on a vehicle I used to
own. The final fix was to replace the baseplate gasket (between the TB and
the intake). There was just a slight leak, which would whistle under the
conditions which you described. As it gets worse, it may begin to whistle at
idle, or part throttle conditions where there is a large amount of engine
vacuum.
SteveM.
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