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I have a similar sounding issue on my 330d. The o-ring for the intercooler pipe going into the intake manifold has split. I will be replacing it in a couple of days so will let you know if that fixes it. Might be something worth looking at.
Very easy to take off and inspect so worth a try before spending big money. Mine is on 130,000 miles.
Cleaning out intake manifold is a shout too as mentioned. Makes a considerable difference and cleaning the throttle while it's off is good too.
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