The first thing you need to do is figure out what general area the noise is coming from.Usually when you get a whistling noise like your getting it's engine vacuum escaping from a leak somewhere.If you let the engine idle and get some carb spray and spray around the intake all the vacuum lines and nipple's etc.Listen for a raise in rpms or a decrease the engine could stumble miss or die.If it does any of those thing's while spraying in a certain are then you have a vacuum leak in that area.Let me know what you find.Just be careful spraying around the hot exhaust etc.
May 30, 2011 at 7:10 PM