Why is my car shaking when idle?

Here's the back story. Car is a 2001 Ford Focus hatchback.
Check engine light recently went on for a EGR censor.
As of yesterday my cruise control will not work, and when I went to turn my car on today it is making a chugging noise and vibrating. When you gas, it stops vibrating however as you slow down it starts again.
What are possible things wrong with the car?
(And yes, it has plenty of gas just filled up two days ago.)

First thing check the fuse for the cruise control to make sure its not blown. The second thing to check is a vacuum line.A lot of cruise control servos are operated by vacuum. If yours is vacuum operated, there's a good chance that the vacuum line goin to the cruise servo is leaking. This not only causes the cruise to malfunction but also causes the engine to idle rough.A rough idle will cause an engine to shake. The cruise servo will either be installed under the hood or possibly inside of the inner fenderwells. There's usually a vacuum tree which allows you connect numerous vacuum lines to it, mounted on firewall or inner fenders usually. Try to locate this part. If you can't find a part like this, trace any vacuum lines you see to the servo.Once you locate servo, check this vacuum line for leaks.Let engine idle while you spray carb cleaner or propane from a small torch around the vacuum hose and servo. The engine will idle up, down, or it will stall if you find a leak.Repair as necessary.

There might be a vibrator in it

My girlfriend's 2003 was making noise & shaking - Found it was a worn engine mount, the one on the passenger end of the engine.

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