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The ICV of an M102 (almost certinaly identical) has a 'zero' position (i.e. if you disconnect it) of slightly open. This means that if the wiring system fails then the idle control valve will be left slightly open ensuring your car idles ok if a little high. This information may help you diagnose.
I think that a little current to the ICV closes it up, but then applying more and more pushes it past that point and on to opening it right up.
You can squeeze the pipes going into it - the idle will be caused to dip but the engine should respond by opening the ICV and the idle will raise up again.
I had an idle-only misfire once on a 1986, it was due to the pipe going from cam cover to air cleaner coming loose.
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