I have a 1990 Plymouth Laser RS Turbo. At 3200 RPM's it has a vibration under the hood that you can feel in the foot feed. It vibrates enough that the dipstick will vibrate out of the hole and spew oil all over the engine. We have check the timing and the motor mounts but nobody can seem to figure out why it is doing this. 3200 rpm is between 65 and 72 miles per hour, So it is right at the cruising speed and driving me insane. Any help or ideas would be greatly appreciated.