Lots of missing info. What kind of car is it in? What year engine is it? is the map located on the throttle body or is it separate from the engine? It will throw a map sensor code just becuz the engine is runnin poorly and shuttin off not cuz there is a prob with the map. The map can cause it to run bad but Map sensor is prob not the problem unless it is separate and the vacuum to it is disturbed (i.e. tapped off of or line has a crack or hole in it). Does it even rev smoothly? This sounds really bad and u really shouldnt be driving it....esp not to those extremes.