!!!!HELP!!!! haunting missfire wont leave!!!!

Did you use the same intake on both motors?Could be a warped intake and therefore have a vaccum leak? Does it miss at an idle? If so have you shorted out each cylinder while it is running to detemine which cylinder is not making power. Have you disconnected all the vaccum lines going to the brake booster, to other accessories to determine if a leak is creating a too lean condition? You need to find out which cylinder is not making power to start narrowing things down. M2C