Hello! I have a 1998 Expedition XLT and have been having problems with the Anti-Theft System. If we leave the tailgate/hatch open for an extended length of time (20 minutes or more), the truck won't start and just the Anti-Theft light flashes on the dashboard, but we can jump start it and then it's just fine. This also happened when I turned the truck off, but left the keys part way in the ignition. From reading the Owner's Manual, it seems that we're supposed to have some special key to put into the ignition and then take out and then it will start. Does anyone know about this??? Any advice is much appreciated!