I think a coil pack went bad but when I unplug each one individually the engine runs worse all six times. If one were bad, wouldn't the engine run the same when it was unplugged. I had all the symptoms of the bad coil though. I had a flashing CEL while driving in the rain and it ran poorly but it went away after the rain. A month later I started seeing the CEL blinking while accelerating or going up a hill, it had a loss of power and I felt a vibration through the car. I can tell the car isn't running on all 6 cylinders and there is definite loss of power but the idle is only a little rough. Is it possible the coil is okay enough to idle the car but under a load it fails?