Antitheft

Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your Ford Mustang. Based on the information provided with how the engine turns off on its own while driving down the road and that the vehicle battery has already been replaced and a jump start is required to allow the engine to start and run again, this can indicate a possible fault with a component like the alternator itself failing, a possible wiring concern leading to the alternator or battery or even a battery connection issue. This type of fault can also be caused by a loss of signal to the alternator to tell it to charge the battery which in some cases can be caused by an internal ECM (engine computer) fault. I recommend having this concern looked into/tested further to determine the cause so it can be repaired properly from there.