You sure its not a loose engine mount? If not could be misfiring due to the components below-also do you have a check engine light and when was the last tune-up??

http://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-

Answered by rasmataz
68 questions asked

Hi sounds as though you are experiencing the same as I have just been through, the initial fault was a 'duff' replacement spark lead. All were replaced and new sparks installed, the fluttering continued intermitantly during low revs until the vehicle went for a routine service and the idle control valve was removed and cleaned.

Answered by The Gronk
0 questions asked