Since the black on those plugs goes up the threads, that hints at an oil issue, not a running rich issue (though maybe it still is just running rich). The correct Denso plugs work just as well as the correct NGK plugs. Most 5vz's came from the factory with 3 of each...

What year is the truck? Since you talked about the wrong ECU pinout, I'm assuming you have a '96-'98.

Interesting to see such bad short term trims - but I guess the long term trims just haven't had a chance to adjust yet since it hasn't spent much time in close loop.

It is easy to miss the air assist hose, so maybe that's where your air leak is coming from (if that is the issue!). I suppose it could also be a bad O2 sensor always reading lean, so the engine over-fuels? Stuck injector(s)?

-Charlie