do the silicon trick. i have missfire at the moment too. didnt want to fork out for splitfires till i knew it was the coil packs. siliconed em up worked for about a week. but at least i know its the coil packs. splitfires are on their way.
few people are buying splitfires only to find they didnt fix it. alot of money spent and still miss fire. my suggestion, silicon em up for 11 bucks then if it fixes it you know you need new coil packs. if not either you didnt seal em up good enough or your problem is else wear.
just my 2 c