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In addition your Idle Control Valve might need a good cleaning. Very important to check the two hoses for cracks. Just did mine Sunday morning. It's going to take a hour at most. There's a pretty good write up on bimmerforums google it. The rear boot on the intake manifold is going to be tough suggest hitting it with good ole WD-40 and using the closed end of a combination wrench also when putting it back on pre screw the bolt back before placing it the bracket.
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