hi i ahve a 1.9 tdi galaxy it wont turn over at all when i tow it it runs for a while then stops all lights work doors lock . fuel pump pulses as it should its like immobiliser is on , car had problems before that car would run but cut out while slowing down ,then take ages to start then run ,i changed fuel filter as i was told that needed doing fuel is at the top of filter put still cut out . heeeeeeeeeeeeeeeeeeeeeeeeelp