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Im not sure what it is, but my stock 91 5.0 did the same thing. People thought i had something i didnt. Not cool. I only removed the intake sliencer and k&n filter. I did the same to my 4.6... no noise.
i think its b/c the tb is either too big or too small for the intake opening...i dont remember which.......i think too big.......thats why you wanna port match the intake and tb.