Mass airflow sensor or O2 sensor?

The lower numbered codes are generally changed first and then related codes will some times disappear.Sounds like a MAF sensor is defective.Either one can cause stalling .It was my experience on my Buick Park Ave.,the stalling was caused by the MAF sensor.To check yours ,simply unplug the MAF sensor and drive.Because the computor has a back up for the MAF sensor if the problem has then been eliminated,replace the MAF sensor.