I've got a buddy with a '92 Accord, automatic, and there's a very noticable vibration, only when the car's in reverse and warmed up, when it's cold and at a high idle, the vibration's gone.
So far, I've gone through and checked the following, all motor mounts, all sensors, resistance readings are within specs. replaced the rear motor mount as it wouldn't hold a vacuum. cleaned the throttle body, checked for vacuum leaks, checked to see if the EGR was stuck, or dirty. Reset ECU numerous times (no codes). Also messed with the idle, giving it a high idle will help, but it's gotta be above 1k. So really, so far, nothing has helped.
Any ideas would be greatly appreciated.