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I was chasing random codes for a year, finally found (thanks to the forum) that my MAF connector was bad. The wires become loose from vibration over time causing the computer to freak out from the erratic MAF signals. FCP Euro sells a little kit to replace it, costs like $25. All of my codes are now gone and the car finally idles and runs great again. Not sure if it's the same on the M but on the 3.0si it is.
Hope this helps!
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