Yep, my truck did all of these things, with the exception of the code. It was also totally random, never related to weather or road condition (uphill, downhill, turning left or right, etc).

It just kinda did batsh*t crazy things randomly, and other times it'd be fine.

Replacing the TB solved all of it. I used a Tundra TB, I'm unaware if there's a particular difference between that and the 4Runner TB. I was about to go down the route of replacing the O2 sensors but came across that other dude who had the TB replaced, solving his issues.

Re-reading my previous post, I don't know why I said it didn't bog under accel, I recall one day in Surrey, I had no ability to apply power; like, the engine would produce just enough power to move the truck forward at constant speed and nothing more. Thankfully it started that shit after I got off the highway, but it was pretty scary because it could have happened 5 minutes before and I'd have been in REAL trouble.

I arrived, shut it off, said a prayer to the God Boost, and his disciples, Intake, Compression, Combustion, and Exhaust, so that when I return to the truck I can make it all the way home. And the gods blessed the 2UZ, she fired up and got me back home.

I swear I was a few microns from using a Molotov Cocktail to fix the damn thing.

The first sign of problems was it stalling on me during a snow storm turning left in a neighbourhood in winter of 2014. 2 years later, it did it again in the dead heat of summer. Then around ~2018 or so, it did the above mentioned shit every other week.

I don’t care for aftermarket MAFs and TBs (and numerous other parts) due to issues I’ve had on various vehicles with them. It does sound more like the TB in your case.

why are people using tundra throttle bodies?

Sounds like I need to try replacing the TB, I hit a bump and that seemed to cause the issue which sounds similar to the story referenced.

appreciate the insight

Probably because there's many times the number of these exact same V8s that came in Tundras than there were in 4Runners.

I think I still have my '04 Throttle Body sitting in a box somewhere...

It works perfectly fine, the freeze plug on the top was seeping coolant so I just sealed it in FIPG and kept it in case I ever needed an extra...

When you replaced the throttle body did you have to do a relearn at all? Or was it running fine after installing it?

I think the shop had disconnected the battery long enough to have to relearn the fuel curves. But it was a long time ago, so I can't say for sure.

In any case, it ran perfectly after changing the TB. All the shenanigans it used to do were immediately gone... She just fired up and ran.