Hiya folks, first time post here. Along with my 2K CLK430 I also have a 1974 450 SLC. I am wondering if any of you, who also have a 107 chassis based vehicle experience a rough or vibrating idle. When stopped or in park the engine feels like it vibrates a little too much. When driven, the vibration disappears at around 15-20 mph and from there on up, it is smooth. Thanks in advanced for any comments or solutions that you may have.