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Suggest your install new MAP and IAC. If you can find the GM OEM parts they will be a lot more reasonable $ . I have replaced the IAC on our 8.1 GSII-A with the GM part about 70% less $ than the VP
I have a pair of 2001 VP 8.1GSiI-A,V drives, approx. 1300 hours. Have a whistling noise from port engine that gets worse in gear from a little above idle up to about 3000/3500 RPM under load, then starts to diminish above that. Certainly sounds like a intake leak at or downstream of the throttle...