Recently replaced plugs, coils and injectors due to cylinder 1 injector failing (and fuel pressure too low). Ran for 10K miles or so before cylinder 1 misfire (and fuel pressure too low). Today replaced fuel pump and filter yet again which appears to have resolved the low pressure fuel system pressure too low issue but I still have a cylinder 1 misfire. Bank 1 LTFT's about 2-3% positive compared to Bank 2 @ 0%.

Only thing I can think of is the valve cover has been leaking for a few years but it's never been a problem. I was going to replace them when doing the injectors, etc until I realised I would have to remove the super charger yet again and I just really didn't fell like doing that.

What do you all think, valve cover or something else?