questioning noise

[Keatonc]

I have a weird noise like a bottle rocket. Happens when there is high vacuum in intake manifold. It is around the throttle body i think. Hard to tell when I rev the engine its too loud to locate the noise. only when throttle is closed and rpm is high. what could it be?

 

[hornsfan10609]

Must be a gasket leak, you can spray soapy water or brake cleaner around the gaskets and TB to try to locate the leak.