The afm is inbetween the turbo and the pod/airbox
You can buy afm cleaner or cleaner specifically for electronics from autobahn/supercheap and the like,
Not to sure about the fuel pump, I know when mine was on the way out it was whigning and carrying on,
Sometimes u can't see the cracks in the coilplacks, either wrap them in good quality electrical tape or a better option is heatproof silicon.hope this helps
-Trent