I have cleaned the TB and IAC but not since I first bought it and replaced the OSV/PCV/Cyclone Separator and did a major 60K tune up albeit at 86k. Car now has 145K on it. So seems as if it's almost time for another 60K tune up.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean