I made it better and worse at the same time, please help.

I'm kind of surprised for it being a non field replaceable part, they didn't use security Torx or security bits of some kind. Or put "do not remove" on the part itself.

I noticed in all photos of both used and new throttle bodies, the screw heads are in the exact middle of the oval slots on the sensor, as shown here.



I can't imagine an adjustment of say 3/1000" would make that much of difference.

Could it be possible bad fuel would cause it to run like this? The last time I filled it was at some podunk gas station out in the sticks. I'm wondering if the fuel was bad, if the ECM is trying to lean itself out to correct it and going too high out of spec.

Or could the injector being stuck open and fouling cylinder 1 "poisoned" the catalytic converter?

On one of the PCV hoses feeding the TB, it was split in two spots about .3", I trimmed the bad off and reattached it. I did double check all the hoses and none were crossed.

I also tightened down the bolts on the intake manifold a couple more foot lbs. According to the internet, a slight increase in torque is required for Fel-Pro brand intake manifold gaskets.

I left the negative off the 12v battery for 30 minutes and hooked it back up. I'm going to take it back out on the road and hopefully it's better now, fingers crossed.

 

I got it fixed.
Toyota uses these weird little "squeeze type" hose clamps for the hoses on the PCV system. Not the ones you need pliers for, but ones you can literally open with your fingers.
When I bolted down the wire harness that sits on top of the cylinder head, I must of put pressure on the clamp with a bracket just enough to fling the hose off.

This is what I saw once I took the wire harness back off.

 

Drove 15 miles round trip and it seems like its running better than ever before.
https://i.imgur.com/hMNt8US.jpg
Got almost 55 with no AC and cruise set at 59.
But would like to ask, why does speed make such a difference in MPG on the Prius?
I can only get about 40-41 at 70-72 on the interstates.
15mpg loss only going 12mph faster?

 

I'm sure there are some drag issues. I'm missing two of my wheel covers, the ones that cover the edges the aluminum rims.
The lower black strip on the front bumper is cracked, and I'm missing one of the grilles that go over the fog light area (mine doesn't have fog lights).

I do know the new tires I have on it (Michelin Defenders) aren't an "eco tire" but the last set of LRR tires I bought seemed to wear out much faster than usual tires do. I inflated the fronts to 44 and the rears to 40. (Sidewall says rated to 50PSI).

I also think the last few tanks of gas I got were E15 and not E10, which cuts down into the mileage.

 

Drove another 30 miles today and seems to be doing well, however...
I noticed when the PCV hose was disconnected, it seemed to have a hell of a lot more acceleration.
I did take the PCV valve out prior to all this and make sure it rattled (it did).

 

I put some more gas in it and the gauge is still showing empty.

Does the fuel gauge need calibrated when the 12v is disconnected?

 

Topped it off and gauge is working like normal.

Still have little power from a dead stop. I need the AC topped off anyway so I'm going to take it to Toyota in a few days.

 

Looks like it's going to be a while...
Local dealership is 10 days out on service...next closest one is 3 weeks out.
Shortage of techs?