Re: Sudden engine stop on freeway....
If there are no stored codes, that pretty much means its losing PCM power or has a bad PCM ground.
Any other fault, including the fuel pump, will trigger some sort of code (even if that code isn't apparently relevant.... Fuel pump fault will trigger O2-sensor-lean codes for example). At least that has been my experience.
Do you have some sort of aftermarket anti-theft system? Any tampering with ignition wiring increases the potential for power interruptions to the PCM.
2000 E450 dually V10 wagon