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I can't see your profile but if it is an N52, that sounds similar to what I had on my wife's car. Intermittent rough idling, stalling, etc. I didn't have misfire codes tho, I had a eccentric shaft sensor intermittent failure. Turned out to be that the sensor got fouled by oil. If you had a cracked valve cover, I would check that. The sensor is towards the front of the car on the valve cover. There is a circular gasket for it. If it is seeping oil, this might be a lead...
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