The idling of my VW Golf Mk2 was unstable and I found out that the "Idle Control Valve" was broken.
So I got a new one and replace it. After replacement, I found another problem.
When I had a drive for a while, the rough idling occured to my Mk2 again.
I checked several parts and found out the following hose is squashed due to age-related deterioration.
This hose connects to "Idle Control Valve".
![Idle Stabilizer (Idle Control Valve) for Volkswagen Golf Mk2](enginroomitems/idle_hose/002.jpg)
I repaired this hose using suitable spring.
![Idle Stabilizer (Idle Control Valve) for Volkswagen Golf Mk2](enginroomitems/idle_hose/003.jpg)
Insert spring into the hose.
![Idle Stabilizer (Idle Control Valve) for Volkswagen Golf Mk2](enginroomitems/idle_hose/006.jpg)
After that, I applied silicone sealant and wrapped silicone tape around hose.
![Idle Stabilizer (Idle Control Valve) for Volkswagen Golf Mk2](enginroomitems/idle_hose/009.jpg)
I could get the stable idling.