hi all, i recently bought a 2006 / 06 a4 sline 2.0tdi auto and 3 times upon starting it has sounded like a bag of spanners very very rough and then stalls 1 second after turning the key back. everytime it has done it it has been upto temp then restarted around 10 min after being turned off , as if it is temp related. so far i have not been able to replicate it and has not done it for over a week. there are no fault codes logged when i have scanned it with vcds. the car runs and drives perfectly. any ideas anyone ?