dumbleoverdrive

My 2000 z28 has a idle surge only in gear. In neutral it idles fine. Also has a very rich smell at idle and at lower speeds. Only code is o2 sensor bank 2 sensor 2. Anyone know what could be wrong? Also have good fuel pressure 58lbs. But is hard to start after sitting a while. I know its dropping pressure with key off and on with car not running. But running holds strong at 58.