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I have 2007 3.6 Tiptronic Wagon and it is intermittently idling around 900rm vs 600rpm. Not a huge different except it feels as if it wants to take off if I release the break and is hums a lot louder than normally. It seems to be a bit louder with the AC on, but turning off the AC does not allow the idling RPMs to drop. If I shift to neutral the RPMs do drop to normal, but will jump right back up when I shift back to drive. It also seems to be running louder at speed. This RPM issue seems to be more when it is hot outside and the car is warm, but I can't say with certainty. Seems like something is gunked up. Any experience with this? I have not run the Vag Com yet.
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