just changed the fuel filter on my 110 afn.started up after a few cranks.now ive got a flat spot 2500 and picks up at 3000.im getting vag.com done 2morrow by a friend.he reckons it could have possibly stored a code for low fuel pressure.im not up to scratch on all this v,com stuff.car ran fine until fuel filter change.dont think its going into full limp mode tho,well maybe for a few seconds.any ideas