I have a 97 LeSabre Limited that will intermittently lose all electrical while driving. Everything goes out, motor quits, headlights go out, clock and radio presets are lost etc. Sometimes the problem is just for a few seconds, short enough where when the power returns and the motor is still spinning it will restart itself. Other times I need to pull over, but then it starts right up, maybe 15 seconds total. Battery and charging system check out good, connections are good, grounds seem to be good. There is one fault code for a weak MAP sensor, a little out of range but the car runs fine. Getting scary driving at night, any help?

if everything goes out, its got to be one of the primary cables maybe you missed something. i would take apart and clean every big cable at both ends. if that doesnt do it i would run the engine and start yanking on them till you hear the engine shudder