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      03-06-2010, 07:02 AM   #2
tofu4
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Drives: Z4 3.0
Join Date: Sep 2007
Location: Cali

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DISA Failure wouldnt cause a rough idle. In fact you can take the butterfly out and the car would run fine. As long as the electronics are plugged in you should be good. The rough idle is most likely caused by the IDLE REGULATING VALVE. See number 8 in the illustration.
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