Going solely on the fact that you chose double plats I assume you have the duratec. (You should really post year/make/model/engine/miles anytime you have a post about trouble.)
If you changed out the coilpack, there are vacuum lines there that are VERY brittle after age.. to the passenger side of the coil pack, behind the UIM.
the EGR lines are VERY brittle as they age.. basically any of the green plastic lines are all vacuum lines.. there is a vacuum line routing chart stuck inside the engine bay somewhere, as a sticker...
Ray
