[barks]

found what i think to be the problem,

i went to fit a new o ring seal to the aos to pcv pipe at the aos end and i relised it should have the same fitting as the top pipe, push hard and it snaps on to form a tight seal.
the whole ring had been broken off previously and so when intake blanked off the oil would come out and when aos connected to intake the diaphram couldnt close at high vacume due to air being sucked in.
new pipe ordered and might as well replace pcv.

treated it to a new set of bosch coils and plugs today then washed it. :-)

cheers barks