Definitely didn't crack a plug. Torqued 'em to 14. Was REAL careful putting them in. The plugs that came out had less than 10k on them, and looked brand new. I only tried plugs as a first step b/c I thought the E85 might've fouled them.
When I started it up with the new plugs the idle seemed smoother (due to fuel trims being reset from disconnecting battery?) and the misfire happened within 50 miles. After the fuel filter there's less "chugging" (FF was NASTY) but misfired again within 30 miles.
Went to clean the MAF today....and there's no o-ring. Nothing. Waiting on a ride to get a replacement o-ring and am hoping that clears this up. Can't hurt!