Both my Focus's seem to be doing this - Can't say its my driving technique as my other cars previously have never done this.
When in traffic or slowing down in say 3rd or 2nd gear the car seems to judder as you hit the 1k rev mark. Once dropping below this the juddering stops.
Clutch feels fine, drives fine.. no slip if put in 6th gear and floored.
Does my head in as i have to sit in at least half hour stop start traffic for work each morning and it makes me want to just coast all the time and instead keep dipping the clutch constantly rather than allowing the car to pull along in gear.