This is my first post and am new to this site. Hopefully you have found a resolution to this issue since August. But needless to say, I finally found someone who has this same problem. I have a 2000 LX470 with 120K on it. It is still in great condition. I just started noticing this problem. At idle it rattles or vibrates excessively. I took it to my local mechanic and he metioned that it might be the motor mounts. However he checked the motor mounts and he said they were fine and that it might be from normal wear and tear. I told him to find the wear or tear and fix it...:) So he is during a thourough check now and I will let you know what he finds.