I think with your mods, you do need the 24# injectors, but without a chip, or a proper MAF, I'm not convinced the combo is correctly tuned for them. I've seen cars run "fine" without proper injector calibration, but it might not be ideal. The o2 sensors would inform the computer to just shorten the pulse width way down and you would lower the fuel pressure. Is there an adjustable fuel pressure regulator? If so, I bet it's set under 39psi?
It could be loading up on fuel causing your idle issues.
Run your codes...I'm curious what comes up.
It could be loading up on fuel causing your idle issues.
Run your codes...I'm curious what comes up.