2007 mk5 GTI (85k miles): revs have started to "hunt" at idle. Will go from about 800rpm to 1500rpm, and all inbetween. I also hear a slight whistling noise as well.
The hunting I think is the PCV valve (but that's just from my very limited knowledge of such things!), but not really sure about the whistling - could it be a slight slit in a pipe, or related to the PCV?
The car is already booked in for a service on the 16th March - is anything likely to "fail" before then and leave me stranded, or as long as I take it easy can I probably limp through another week?
Any advice appreciated. Thanks.