Location of Idle Regulating Valve? - 1992 320i

I have a 1992 320i European spec with an intermittent surging idle problem - indications appear to be eh idle control (regulating) valve - besides, it's
an easy fix..
I have my ETK open to the correct diagram (13_0381 Part number 6) but darned if I can find this thing in the engine.
The diagram seems to indicate the location should be painfully obvious - is it stuffed under the manifold or another hose?
Thanks in advance.
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