And can a bad map sensor cause no spark when the car stalls?

 

The spark is controlled by the ECU, so the ECU may or may not allow the coil to deliver spark to the plugs. That would be in the programming of the ECU. You could unplug the map sensor and see if you get spark to the plugs.

The voltage testing would be with the map sensor unplugged. I'd try the testing when the car is working and when it stalls.

If this were my car, I'd probably go to a u-pull-it junkyard and find a few map sensors, so you don't waste money. I would be comfortable with a used map sensor, because I rarely see bad map sensors on this forum.