2003 Exp. Hesitating .

Hello to all. new to the expedition forum. just got a 2003 xlt, 4.6l, and are experiencing a problem with a stalling and hesitation at low speeds. some times it looks like it will stop running, and get the battery light on for a second. the message board comes up with a quick message that says check
....... system. i haven`t been able to read the middle part but it looks like
charging system but i am not sure. it also makes a beeping sound but it`s just momentary. I`ve read about the coil packs,but i don`t have any experiece in this vehicle. Any help or sugestions will be greatly appreciated.

problem solved. missfire on cil. 4. new coil took care of it.