joe crowe

While driving when pushing gas the rpms dont go up it does nothing had to pull over then motor at some point dies.when turning on motor cranks but no start i wait a day car starts fine like nothing happen.only check engine code is bad O2 sensor.just got this car it has 165000 new timing belt at 148000.is this a idleing sensor.fuelpump relay that is just hanging under dash looks like someone checked it.i also had to replace positive battrey term. It broke on me radio stations would reset random but all good after fixed pos.term.
any help would be great.