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The poor idle could be due to the ICV. About all you can do is to insure that it will open and close and is not bound up. One thing that can happen is that the brushes eat the copper ring they contact causing erratic behavior of the unit. The valve is difficult to disassemble. I did it and found what I mentioned above. Can supply a pix if you want. Valve is about 150 bucks so replacing without being sure this is the problem could be wasteful.
About your boost: Have you checked the recirculation valve near the coolant reservoir? It has a nipple on top. Attach a hose to the nipple and apply a vacuum. It should hold a vacuum. If not, replace valve. The valve is held shut by an internal spring as well as positive pressure in the line. So if the diaphragm is leaking, you get no pressure hold. The boost will easily overpower the spring in the valve causing you to lose boost.
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Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
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