Our '02 C5 decided not to bring SWMBO home from tennis on Tuesday. Sudden loss of power followed by the gearbox being erratic & not knowing where it should be. On restarting it ran very rough so was T/Tray'd to my mechanic who won't be able to look at it until next week. Initial thought is fuel filter blocked causing erratic running thereby confusing the gearbox. There will no doubt by error messages which will give some indications but is there any other obvious things that the mechanic should check before getting in too deep? If it is the fuel filter I will be a bit "pee'd off " as it was replaced not all that long ago & we only put in premium fuel from the big green petrol station that is reported to have the cleanest fuel!!! I'll wait & see. cheers Dave