Hi Freddy,
As @jayeff has already stated, we need more information to be able to give you a diagnosis we're confident of.
If you suspect the Mass Air Flow sensor, there's an easy way to test it. Simply unplug it and drive the car. If the stalling goes away with the MAF unplugged, then yeah, it's pretty certain you need a new one. If the engine computer can't get a reading from the MAF, it defaults to preprogrammed settings that will allow the car to be driven but won't give you the optimal fuel economy and power settings achievable with a MAF. With a bad MAF those default settings will run better than the incorrect readings returned by the defective sensor.