my mk 4 golf gti 99 has been playing up. Not starting when warm and cutting out occasionaly. Took it to a garage and it threw up 6 fault codes so he cleared them and i took it back a week later and 2 of the same codes came up.↲↲↲17916 p1508 & 16711 p0327. Mechanic told me it was air getting into the system after the throttle body. He had a quick look at all the pipes/hoses but couldn't see anything wrong so advised me that it would take a lot more (money) to find out the cause. does this sound right? Anybody had the same issue ? ↲Any help much appreciated. Thanks.