Electrical problem
1991 Ford Explorer V8 Four Wheel Drive Automatic 127000 miles
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You will be driving along and all of sudden it will die. Let it set for awhile and it will start and run again for awhile. I have had the fuel pump replace and the fuel relay fuse replace and the wring from the relay to the fuel pump. right now it will run for a few days then all of sudden quit. could it be the fuel shut off switch if involved in a accident relay?? I have done everything I can.

check for spark check crank sensor