Read all instructions carefully look at diagrams and pics with a second pair of eyes. I say this because on restoring my heads coil packs leads plugs hoses that started with a misfire on 1-7 ended up with the same misfire if these machines were easier to change parts on would have noticed my mistake sooner oh still had misfire 1-7 decided to remove Plenum fuel rail coil Packs do some checking injectors tested at 15.2 ohms then looked at downloaded pic of coil packs oh no my orientation was off 1-7 were reversed hit myself on the head stupid mistake all put back runs like a dream. Thanks for all help on this.