Engine stalling While driving down the road

IF battery cable connection becomes lost - the alternator is doing all the work - when engine rpms drop - alternator can not keep engine operating thus it stalls - then once battery cable connection is re-established - normal engine starting and operating is also re-established..

Those EMERGENCY CABLE REPAIR terminals you can buy at most any store are just that - for *EMERGENCY REPAIR* .. Once the opportunity presents itself - the battery cables should be ‘properly repaired’ ..