Ok, I finally found something.

I did the smoke test, and I found one leaking fuel injector port. But then I noticed more leaking from under the air flow sensor housing. I decided to dig deeper. I removed it (getting easy at this point), re-seated the fuel injector and did my smoke test again.

I found a leak on both sides of the throttle body where the shaft comes out and attaches to the throttle linkage and where the position sensor is fixed.

Questions:

Is this normal?

Can this be rebuilt or do I need to find a whole new throttle body?

During my smoke test I had smoke coming out of the valve cover. Is this normal or should there be a check valve in between the intake and valve cover?