I'd fine another Tacoma and see what is normal operating.
Don't read too much into stabbing the gas and watching the fuel trim. Most EFI has "acceleration enrichment" - basically the faster the TPS moves, it simulates a carb accelerator pump, so it's likely go to instantly rich.
The timing doesn't seem out of wack for cruise, but again, I'd want to check with another truck.
There appears to be a factory "tube like" manifold for these as well as the cast manifold. I just sold mine, or I'd offer it up. If you're going turbo, just slap something on there without holes.
The fact that it runs the same with the 02 sensors pulled is a bit odd.. Above 3k RPM, does it peg rich on the narrowbands? Leaky injectors aren't common on these...
