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05 Cayenne V6 Issue: Rough idle while in park, idling at stoplight

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Has 110K miles. replaced plugs / coils about 30K ago. NO CEL.

So at start up, the truck idles very roughly, until you drop it in drive and accelerate. No issues during acceleration / running. But it vibrates again when idling at a stop light. Revving the motor cures the rough idle. 

Maybe crank case vent valve? I would think if it was a vacuum leak or secondary air / fuel pump, it would throw a code? I was also thinking motor mounts? 



Thanks in advance!!

Rob T.

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My 05 v6 has had a small idle issue for probably that last few years. When I start it first thing in the morning it idles fine for about the first 5 seconds. Then it starts to have an unsteady idle. Once I drive it's fine. It's fine if I stop at lights and it's normally fine if I've driven it for a while even if I run in somewhere for an hour and restart it. It seems to only do it first thing in the morning when it's cold. I haven't had any codes over the period of time that it has been this way. During that time period I have had new updated coils and plugs installed as part of routine preventative maintenance but it made no difference in the idle. No performance issue but I do wonder why it does it

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