hi i have an 03 sonata with a 4 cylinder that has a horrible vibration when you start it the car vibrates to the rpms its actually visiblly shaking the passengerside headlight and if you put you hand on it you can feel it if you rev the car the vibration changes and almost goes away after 1800 rpms you dont notice it while driving but when idling you can hear and feel it in the steering wheel then if you accelerate it goes with the rpms and goes away the only other thing i think it could possibly be is a cataletic converter the car had a misfire for sometime then was fixed but threw up catalist codes a couple times any help would be appriciated