while driving down the road the dash chimes and reads emergency saftey shut down on 2006 Ford Expedition

vhehicle is running but i just coast to a stop with no use of the gas pedal i shut it off and restart the engine and continue driving with all dash funtions normal. this has happened twice in 12 months.

Not to say this is what you got going on,but throttle bodies are VERY common failure.Some engine sizes have a replaceable throttle position sensor and some are integral to the throttle body assembly.
thank you. i will check into this.
Have a scan test that can see all modules and retrive ALL error codes. Your mechanic will know what to do.
Snap-On Modis scanner, for example, can do this.
i will thank you.