How it shuts off tells us a lot, sputter is fuel related, so I don't suspect the FPR, but still, pull the vacuum line and smell it. If you smell gas replace the FPR. When a FPR goes out you may see the car die after driving and stopping at a stop sign, it will stall. Also, might notice hard hot starts.

Now, a car that shuts off like a switch was flipped, that'* more electrical. spark simply stops and engine dies. MAF wont do this. I would suspect part of the ignition system. So what can shut the engine down? It'* a short list. Bad ignition system wiring harness, bad ICM, bad cam sensor (not likely) bad crank sensor (this is where my eye is) Have it tested. Does your shop have a oscilloscope? Have them check the wave form. This should be tested both cold, and hot. If there'* a difference the crank sensor is bad.

crank sensor has already been replaced.

Two times now, once with me and the other was another guy. I've seen the wire for the crank sensor come out of the holder, it then rubbed on the harmonic balancer, wear threw and short out. It'* a long shot, but worth looking at.

since i took it to a dealer my friend recommended. He used to work there as a tech and we had his mentor work on the car, i doubt he would have overlooked the wiring to the crank sensor.