hi all.my 98 a6 2.8 auto has started playing up. it sometimes cuts out when you come to a junction or roundabout. it starts again straight away and will be fine until icome to a near stop again. it doesnt do it all the time. i remember years ago with fords it was usually the idle control valve needed cleaning. will this be the same?. where is the idle control valve on my car?. cheers all.