I came across this in my research. It's more generic from toyota so I don't know if it will be helpul. But I do understand not want to take apart the throttle body. (If you do though, change your spark plugs.
As for the whitsle have you checked the insulation around the doors?
I know on mine, there are a couple of place that have pieces torn out and it's very lightweight and sort of hollow. More air definitely comes through those spots near my legs and if you have something similar but in a higher location around the door that could account for the whitsle.
Just a thought. ....