What could cause codes: P0150-upstream O2 sensor P0130-upstream O2 sensor P0327-knock sensor to keep reappearing if the parts have been changed and all connections are clean, only running 91 octane fuel?

No Cats on the vehicle. They just get in the way.

No fuel being shown on scanner to bank 1 short or long trim. Not reading any voltage to either upstream O2 sensor. P0327: Knock sensor 1 circuit low input (bank 1 or single sensor) LH bank signal less than threshold determined from ECM model above 2200 rev/min P0150: O2 sensor circuit malfunction (bank 2, sensor 1) Front sensor RH bank stoichiometric ratio outside operating band P0130: O2 sensor circuit malfunction (bank 1, sensor 1) Front sensor LH bank stoichiometric ratio outside operating band I have replaced the knock and both upstream O2 sensors. Recently I have replaced: Knock Sensor Upstream O2 sensors Valve cover gaskets (not leaking, just wanted to) Plenum gasket Valley pan gasket Upgraded to Magnacor 8mm Champion copper plus plugs Coil pack