I have just done a test on my subaru impreza 1999 and it has come up with a fault code 22

I have previously posted that my car was stalling at lights and junctions and it was suggested it was the Maf but would the knock sensor produce the same symptoms i.e. stalling as I cant seem to find anything about it on the internet or on here

 

knock sensor won't cause stalling. do you a dump valve? if so thats what id check first

 

yes I do have dump value what should I check for as the blink code came up as fault 22

 

i'd remove it and re fit the standard recirc valve first