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Maybe a vac leak?
 

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I have no clue. I would say a vacuum leak from somewhere. What do you mean you unplugged the TB while it was running and the noise stopped. What did you unplug? I didn't even think it would continue to run if it was unplugged.

Could it be a bad gasket between the TB and manifold?
 

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weird. I have no clue. Can't really miss that noise.
 

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Any updates? I'm curious about this one.
 

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Update, the noise is gone, it just stopped on day and hasn't come back. I never got around to replacing the electrical plug. So it's still a mystery to me but I'm not complaining now that the sound is gone.

Thanks to everyone who offered suggestions!
Weird, I guess we'll never know...
 
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