Deeper breather

[haze]

Hi all my van has started breathing heavy I don't know if it's due to dodgy injector washer or the fact that today when I tool of the filter on top of rocker the shaft what it sits on has completely sheared of it has a thread on the end of it but it was defo broke near the thread I've checked air filter breathing hoses anyone know my best way around it take of rocker cover I suppose and hopefully might be able to examine injectors at same time only problem I do have is I carnt find these parts even the filter is a hard one to find.. if anyone knows the part number it would be very handy