My a4 will start then cut out after 10 mins then not start again will take up to 2 hours to get going again glow light not coming on so will not start new glow plugs new 219 relay new crack shaft sensor no fault codes Trying for over a year to get this sorted out but had no joy with over 10 garages can't find problem Audi a4 1.9 TDI se 1998