Hopefully someone can help. I have a 4.4 N62 V8 which I just replaced the coolant transfer pipe,valley pan, intake manifold. Now it idles strangely, it't not rough and it's not missing it's just got a very small vibration - you know when you move your car from neutral to gear and it drops a little, mine is always like that...

It idles around 550rpm and sounds/feels like it has a load on it. I'm thinking that the coolant issue is unrelated but thought I would put it in just incase.

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2004 E53 4.4L N62