sitting and idling ?
possible bad engine or trans mount
have them inspected
Motor is idling rough.
who is this and then i will tell you
Tire out of balance, loose lug nuts, worn wheel bearing, or bent wheel.
Most likely warped brake discs
If it shakes all the time it is a tire/wheel problem. If it only shakes when braking then it is a brake problem.
I have an 01 Optima and it is just under the dash to the right of the steering wheel.
Losse wheel, worn bearing, or more than likely, a worn CV joint.
it's located on the driver side,underneath the steering wheel .
Tire out of balance, bent wheel, or if it vibrates only when braking you have a warped rotor.
Check your power steering fliud, if it is low this could cause the vibration you are feeling.
Not surprisingly, it depends, if the steering wheel vibrates all the time, no. IT could be a whole bunch of things. If it just vibrates at a certain speed range, roughly 50 to 70 mph, it is probably the tracking on your tires (or at least that's worth checking as it is a cheap procedure). Either way, if it makes you feel unsafe whilst driving the car, then don't drive it.
bearings inside your sterring colum need replacing