I have a 64 nova with a rougher than normal idle. I have energy suspension motor mounts and a rubber transmission mount. Nothing is touching the floor anywhere. You look at the engine and its perfectly still but as soon as you get in the car it shakes you all over the car and feels like the engines misfiring.lol. It seems like there is absolutely no give in the motor mount. Is this a common 1st gen problem do to the unibody construction? One other thing is the engine before had rubber mounts and it also had a really rough feeling idle.