Your tires need to be "high speed" balanced.
you need new tirods
usually steering shakes over 60 mph is due to front tires needing to be balanced unless you have something more serious going on.
Tires,inner tie rod bushings, if the steering wheel shakes when brakes are applied - brake rotors warped.
Need some more details. Vibration all the time? Only certain speeds, only when you accelerate, vibration in the steering wheel, in the whole vehicle?
If it only happens when you accelerate the most likely cause is an axle.
That's a misfire-ah....
check c v shafts most common on Chrysler products but wil happen on all front wheel drive cars
Warped rotors
allignment
Steering wheel shakes
could be bad alignment
There is something wrong with it. Or you have one serious engine under the hood