I have a on again/off again problem with my 3.0. From time to time the CEL comes on blinking. Today after blinking for a solid 10 minutes, it quits and the light never comes back on. I didn't think that was supposed to happen. The AC wasn't working too good until the light went off, then it blew cold.

It has a slight rough idle and pops every now and then when pulling away from a stoplight. Except for that, it runs smoothly. I've changed plugs and plug wires as they have about 105K on them. Twice when the CEL stayed on long enough I took it by my local Autozone. Both times it gives a "Cylinder 1 misfire". I've checked the coilpack by pulling the #1 plug wire out and it seems to be firing fine.

Any ideas?