So it happened. Driving home casually, and all of a sudden, boom, CEL. I had noticed earlier that day that it had been acting a little strange, with a slightly different sound at idle, but after some looking into it, I wrote it off, stupidly. The car starts stuttering and stammering, with a NOTICEABLE lack of power, and increase in motor Nvh. Pull over to make sure all fluids are intact etc, and baby it home. Get the SCT plugged in to check DTC's, and of course.. P0308 (cyl#8 missfire):loser:. I knew this wouldnt work, but I tried it in high hopes that it would, put the stock intake back on, and loaded up the stock tune, and fired it back up. No CEL, but still noticeable missfire. Drive it around the block, let it sit for 2-3min running, and P0308 pops up again. Now Im in a spot in which I dont exactly know how to approach. Do I pull the plug and check for craziness, and/or change coil, or should I leave it alone and bring it to the dealer in hopes they dont find the old tune in there? I have a bad feeling it wont be an easy fix, so was thinking of doing a compression test/leakdown to see if its a ring or not, but at the same time I dont want Ford denying my claim b/c I was in there before them. Any ideas are greatly appreciated fellas, and sorry for the book lol. Just pissed/worried, as the car has ran great up until this point (14,500mi). Only mods were JLT intake, tune, and GT500's. Thanks again :beer: