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Did you mean you replaced the IAC on the throttle body .
Okay was the throttle body cleaned out and the IAC bore where the IAC valve fits .
whistling sound, where is it coming from ,inside the car where the brake and accelerator pedals are .
or from the engine side .
Check for vacuum leaks ,could be coming from the intake manifold ,vacuum hoses
brake vacuum hose ,throttle body flange gasket ,
Use brake cleaner spray and spray round the manifold with the engine running any change in engine speed will be the vacuum leak area .
This is the most common issue for a stalling engine .vac leaks