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Not a matter of what parts, but a matter of first finding out if it is a rich or lean mixture problem, then if it is adaptive mixture or multiplicative. (idle vs under load) If it is rich multiplicative (under load) you will need a MAF sensor. If it is lean adaptive (at idle) you need to find the source of unmetered air. (vacuum leak)
From the looks of it you most likely have a vacuum leak. Check the 2 crankcase vent hoses at the back of the manifold. (they go to the back of the valve cover) They are usually the first to go.
Also, what year/mileage X do you have?
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X5 pics
RIP 4.6is.....
2003 4.6is
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08-26-2009, 10:26 PM
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