It's kinda sounding like your injectors are junk. Did you get denso injectors off of rock auto or some other mfg.
I would try what your thinking on your cylinder 2. Put all the originals back in except that one and see what you get.
Also verify your fuel pressure is good at the rail and that fuel regulator is good first. That way if it's bad you may have found the source.
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7 3rd gens listed in the build thread (2 are parts mobiles)
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https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
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