I read on another forum from a member that frequents here as well that the 3.0 coil pack has 4 wires to it. One is the battery power (red), and the other three are the ground wires for two cylinders within the coil pack. These ground wires are controlled by the PCM/ECU to "fire" two cylinders coil pack (one spark is useless to one cylinder, as it would be on its exhaust stroke) based on the crackshaft or camshaft position sensor signal. Since the engine runs, these sensors are good, and unless you have some sort of spuratic vacumn leak, it would point to the coil pack.
What you can try is to wiggle each of the three ground wires to see if the fault is the wiring connector or one of the wires. Otherwise it could be a weak coil within the coil pack, which means the entire unit has to be replaced.
Got a buddy with the same engine you could do a swap with to verify the coil pack is the culprit? I'm not one to keep tossing parts at a fault until it's fixed; eventually you get it fixed, but that method is way too too costly.
Last edited by bucko; 09-05-2014 at 05:01 AM.