His engine has 6 cylinders, so your math is a tad skewed haha.
As for advice, you could get a can of something designed to remove water from your gasoline, something like HEET. I also believe that Seafoam will remove water.
You can also swap coil packs and see if your error code "moves" I cant remember how the numbers go in the 3.5, but the new code would be the opposite side know what I mean?
But yeah, checking the plugs and boots cant hurt anything. Also if you do happen to find its your coil, I have a spare one sitting around than Ill sell you.
You can also crawl underneath the car and give your catalytic converter a good whack with something pretty solid (jack handle, breaker bar, etc) and see if you hear anything rattling around on the inside of it. The idea is to jostle it around a bit, not to rip it off
