The fact that the prev owner did not even have a wideband in a vehicle that would clearly need it, and your neglect to do so yourself and still get on the car shows me you dont…
A wide band is a must especially in a vehicle that was never intended for boost.
If your talking something like a VR4/300ZX/Turbd VW/Suby etc… you ca nget away without one becuase the car/ecu are tuned from factory for it, even if you crank the boost up a bit the ECU has the ability to correct for it.