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It sounds like your Mass Air Flow Sensor is faulty. These sensors will normal show fault when cruising at highway speeds causing the vehicle to almost stall or stall. Replace the Mass Air Flow Sensor with a known good one and test drive the vehicle. This will most likely repair your concern.
This happened to my 1997 Altima GXE a couple years ago. The coolant sensor is bad ($30-40 part). The coolant sensor is reading that the temp is cool on a warmed up engine and actually causes the engine to run rich (thinking it is a cold engine). The problem is intermittant and happened at the worse times.