My car has this sound to the rear tires that really worries me at times. It shakes and makes a noise at the weirdest times. I'm not sure if its even from teh tires, but thats the only thing I can even think of. My car is a dodge intrepid and the car is a really nice car to me and I would really like to fix it but I don't have the money to pay a mechanic right now. What do you think could be wrong with my rear tires to where it shakes and makes a noise when I drive?