Here are a few videos that demonstrate the rough idle I have been having on my 1998 Pontiac Grand AM SE 2.4L.
This first video shows how my vacuum fluctuates between 13 and 15 inches at idle. You can see the entire engine shaking. However, as seen around the middle of the video when you give the car a little gas the engine smooths out.
This short second video demonstrates how the entire engine shakes very badly.
This third video is a little longer and again shows the rough idle.