Because maybe something inside the engine did break loose. For example lifters, rods, pistons, exc. too many things to list that may have broken loose. You may need a new or used engine or rebuilt old engine.
Running, ratting, rattling, reading, rereading, realizing, and retracting.
Beyond the Expedition Running the Sahara - 2008 TV was released on: USA: 2008
Beyond the Expedition Running the Sahara - 2008 TV is rated/received certificates of: Australia:PG
No
Bad Battery. Bad Alternator. Lights left on by mistake. Something left running. Exc.
200 at autozone.
Check the battery connections. The vibrations from movement could be rattling a cable loose. tighten them down after cleaning them.
Bad Gas milege Gives a rattling sound if it breaks down Car stops running if it is totally blocked
Well without further analysis or information, a short answer would be that your engine is BROKEN.
Fuse #9
Chances are, that you are running too much timing, bad spark plugs, wires or cap and rotor. Try running premium gas through it and if stops then you need to back your timing off a bit.
The wiring diagram for the running boards on a 1998 Expedition can be found in the vehicles service manual. the manual could be available through your local library, or can be purchased at most any local auto parts.