M10 Idle issue Anarchy

[graf]

My 1984 318i is experiencing idle issues. It idles at about 1500RPMs then fluctuates from 1300 ish to 1500. It still drives fine but I would really like to fix this issue. Any ideas of what is causing the idle fluctuation would be very much appreciated. ;)

Also is the economy gauge supposed to go past 25 when your idling?

[graf]

My icv is missing its mounting bracket could this cause a fluctuation.

[Smelser]

vacuum leak?