i did a visual inspection of the subframe mounts and i can't tell if they are collapsed. They seem to look ok but it's hard to tell. I know the difference between idle shake and this. It's the vibration (felt at all speeds in the car). I guess i am just trying to figure out why it has this chassis vibration. Can someone explain why bad injectors could cause this problem. (i understand the shaking part of bad injectors.. but not the chassis vibration). That will probably be the thing i do next.