i tried looking for one months back, but very difficult to get, is yours a L-jet or Motronic version ?
so what i did, got one used one, condition 7/10, transferred some of my parts to it to complete the housing. My problem was the butterfly valve was 'makan' with the housing and getting stuck, that's why with the jerk, furthermore irregular idle.
Mine is motronic, been looking high and low ... Last resort, ebay usa, usd26 only but plus shipping its usd60. Think its still worth. Got a relative coming frm us end of tis mth so may the throttle body may tumpang her home