RedVR6

The car was still not 100% after the trip with the system cleaner in the tank, so I was thinking a new ISV would be needed. However, having heard good things about Shell V-Power fuel, decided to try that. This seems to have finished the cleaning job as one time, the car coughed and gave out a bit of blue smoke from the exhaust and has run perfectly ever since with no erratic idling or cutting out. Thanks again for the help and suggestions.

Spent an hour at the local VW garage yesterday, He took out and cleaned what I think is the ISV and it was full of black, greasy sh1t. Also discovered the water temp sender was mis-reading, so replaced that too. Car running much better, idling is stable and only cutting out occasionally. I'm off on a 150 mile round trip today with a bottle of cleaner in the tank. If this doesn't cure completely, the ISV will need to be replaced. Thank you for your suggestions.

Hey, thanks for the help. The car was 'off the road for 6 months and I've just got it roadworthy again. When I first started it, the idling was very unstable, in fact it wouldn't idle initially. However, it's been running good for a couple of weeks now and 2 days ago started this. The problem seems to be after the car has warmed up now, as it starts with a little idle fluctuation, then cuts out after engine hot.

Can someone tell me what the piece is circled on the photo. The Golf has developed a habit of cutting out, and having very erratic idle speeds - going between 400 and 2k rpm. Having read what I could, I understand about the idle stabilization valve and also that air leaks can cause this. I have put some insulation tape around where I think I can hear a leak, but am unsure of what this part is and I don't want to pull it off, only to have it break until the shops are open again. At least the car is performing normally apart from this idling issue. Thanks Gavin