My daily Mk4 VW Golf GTi turbo 1.8t AGU developed a mystery misfire, see how I fixed it!

One thing to note, I'm not a trained mechanic and I am working on my own vehicle. This and videos like it are here to serve as inspiration and to give you a clue about what's involved in performing an upgrade like this. If you are at all unsure, please seek professional assistance when fitting and upgrading new parts and most of all - be safe car lovers.