Where is the coil pack on a 06 Ford Expedition?

On a 2006 Ford Expedition, the coil packs are located on top of the engine, directly over the spark plugs. They're fairly easy to see once you pop the hood. There's usually one coil pack per cylinder, so you'll see several of them arranged in a row or two rows depending on the engine configuration (4.6L or 5.4L).