Check engine light?

I'm not sure what's wrong with my car. Recently my car started stalling while I was driving. Then it started happening when I came to stops at traffic lights. To the point that it would even cut off. At first I thought it was my MAS sensor b/c my mercury cougar did the same thing. I replaced the sensor and it kept doing the same thing. Then my check engine light came on and I went to Auto Zone and the read-out said it was a misfire. I checked my plugs and wires and they're fine (I had just replaced my plugs a month prior). I went ahead and changed my wires to be on the safe side. In the process I discovered I had a hole in my pvc hose, so I replaced that. The other day, I drove my car to work and it was fine, but when I was going home my car wouldn't start. I left it there and tried it the next day and it started. Today, my check engine light is back on and it's still doing the same thing. Went back to Auto Zone and the readout is saying it's my MAS sensor. It hasn't been a month since I replaced it.

Computer problem
2003 Ford Taurus 6 cyl Four Wheel Drive Automatic

the car shakes and tries to turn off when pausing or coming to a complete stop.