Replaced both front (pre-cat) O2 sensors due to the usual (171,300, etc.) and codes are cleared and not returning. Once warmed up, still feels rough when gently accelerating under load at lower revs. I can monitor the sensors and other stuff in real time. Can I assume that the voltage from both sensors should be approximately equal? If not, what is the difference telling me relative to the two banks? Injector issues? Plugs? Again, I'm not getting a CEL or any codes, it just doesn't feel right. A MAF problems would affect both sides, I would think.