I cant figure out if this noise is normal but im considering pulling the intake again this year sometime and/or replacing parts.
https://youtu.be/cpAfInlPk90

 

Is it possible the intake manifold collector is allowing air in somehow?
Is it common for these to crack or leak after so many years?
I did pull the TB and re-sealed that and the egr block off plate and still this hissing noise. I grabbed a mechanics stethescope from HF a while back and thought it was the egr block off plate seal but i cant seam to pin point this that way.

 

Use the brake parts cleaner trick. If you spray it on an intake leak you'll notice a change in the RPM right away.

 

What i did ​​​​Was
Removed the​​​​​​ intake piece that attaches to the radiator support
Then​​​​​​ started the engine and covered the hole before the filter and the car didnt stall.
Also tried starting the car without the air cleaner box and car wouldnt start.

 

Thanks i checked again and im finding the manifold to be pretty well sealed up.