ECM Codes P0178 and P2119?

I noticed a few times while driving when I would hit the brakes, my RPMs would drop to 0 and car would go in a 'stall" meaning the ignition is still on and in drive, but I would then have to shift into park, turn off the vehicle and start again. I would also notice a rough idle at times with the RPM when I would first start the car, when parked and driving.

I also began to notice when I would go to the gas station for fuel, when I would open the tank cover before turning off, it has a rough idle/drag to turn off. Once I'm done getting the fuel and go to start it would be a drag/rough start. I have even noticed a change in my fuel efficiency and performance.

I had my car scanned and received the codes 'P0178-00 Fuel Composition Sensor Circuit Low Frequency' & 'P2119-00 Throttle Closed Position Performance'. The throttle body was cleaned, so the stalling has stopped but still getting the codes and also having the other symptoms. Do these have to be replaced?