just wonedred if any one can help me . a friend of mine has a astra 1.6 sxi 2003 model .It sometimes cuts out when he dips the clutch or brakes at the same time he,s had it in the dealer a number of times and they have no idea what it is ...They have checked and cleaned the thottle body upgraded the ecu cleaned injectors . He is getting fed up with it and would be greatfull if any one could help thanks...ian