The shaker was removed while troubleshooting so that's ruled out.
Had the altenator rebuilt last month but noise was before that, regulator was shot.
That's what I was thinking was a bearing. Only does it on cool days and as long as it's cool out it makes the noise,even after driving around for 30 or so minutes. So motor warming up doesn't affect the noise either.
Only very slightly obstructing the air flow into duct with my hand and not touching either the noise stops or revving up to 1k rpm's .
I sprayed a little throttle body cleaner in the throttle body to see if that would make a difference, it didnt.
When I feel better I'll get the scope out again and see what happens.
This has worked for me while diagnosing a noisy accessory:
WD-40
Spray it on one accessory bearing/pulley at a time. When the noise stops....