If you are sure it isn't missing, then check for vacuum leaks on and around the engine. That could cause a vibration. As far as your question about the coil pack, remove a spark plug and check for spark. You should be getting a hot blue snapping spark to the plugs. If you need directions on how to check, refer to our homepage under the DIY section.
Let me know what you find.
Tuesday, July 2nd, 2013 AT 8:17 PM