The quick easy things to check are
-Is the idle speed correct? It should be 650rpm or so at idle. if it is significantly higher then you should do the idle/throttle position relearn procedure
- Are the engine mounts bad/leaking fluid/cracked
- I personally would change the transmission fluid, and only with Nissan Matic. I have felt the difference in smoothness first-hand vs Castrol transmax which claims compatability with Nissan Matic.
There are other transmission related things that would require connecting it to Consult to diagnose.
I am in no means an expert but those are the first things I would check.
NICOclub's Nissan forums and Infiniti forums and all affiliated sites are the property of HDS Holdings, Inc.
They are independent publications and are not affiliated with or endorsed by Nissan or Infiniti.