I'm actually running the original 68mm MAF AND housing for now. I have to find the bigger housing somewhere.
I've taken the TB off and on several times now and checked the o-ring each time, so I know it's in that groove.
I actually went back to the original 68mm Throttlebody and it did the same thing, but was bouncing between lower RPMs, maybe around 1200 - 1500.

When I press the gas, the RPMs shoot way up to like 4000 and hold there until I shut off the car.

As far as hoses go:
- Y-hose with the 2 connectors on top of the TB
- Hose connected to driver's side of the elbow

That's all of them, right?