Where does the smaller of the two breather pipes found on the back of the 20XE cam cover actually go?
My mine seems to be blocked as it is very difficult to blow through. I thought that this could account for my poor running, so I've been driving with this pipe disconnected, which has improved the running. Can this cause anyharm. I was thinking about maybe making a filter using an old pair of tights or something to cover the hole left behind.
goes into the plenum chamber above the throttle butterfly iirc - the apparent blockage is due to the throttle being closed - try holding it open and trying again - if it still appears blocked, something is wrong.