Looking at this lot, I need a MAF which I am about to go and buy, and I need a brake light switch, which I picked up this morning. I also bought a new central locking interior switch on ebay. The stuff about the injectors bothers me the most, as I get a misfire at 3-4k revs on 3/4 to full throttle. I don't really know how to decipher the codes for them though? What is it that needs doing or replacing? Anything else I should treat as a priority here?