I had the same problems you guys had when mine was replaced about 2 months ago. It almost made me sick when I drove my car. My service manager told me to put about 500 miles on it and if it wasn't any better, bring it back. It seemed to get worse than get any better. I took it back and they tinkered with it for 2 days. Whatever they did, it worked. It even seems like it's getting smoother the more miles I put on it.
