Thanks everyone for the feedback. I took at look at all the vacuum hoses and everything looked perfect- sans the one that connects to the little y-clip above below the throttle body- I can't quite get to it at this point.

I'll check that part first- as that little y-plug seemed to not be very tight when it was originally installed. If that's not the culprit I'll have to remove the manifolds and check the gasket (ie and install a new one- it's only a one time use gasket).

If THAT doesn't do it I don't know where else to check. I don't know if anyone remembers but I've had a bizzare sound between 1500-2500 rpms that sounds high pitch.
https://www.crossfireforum.org/forum...nge-noise.html
When I had Chris's brother's shop install my super cooler they looked into it and said it sounded like it was coming from the throttle body. Bizzare....though I don't know if it's related.

Thanks again everyone!