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If a MAP sensor has a catastrophic failure the computer should ignore the signal and assign a set value to that input. This will turn on the check engine light and put the vehicle in what is referred to as a "limp home mode". With that said I have seen a few isolated cases where the map sensor was melted and the 5 volt refferance signal was going straight to ground. In the cases I'm referencing the vehicle would start and run for a few seconds then stall. I have seen this condition twice on a 7.3L powerstroke diesel in E350's.
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