Check that you haven't thrown a wheel weight. Sounds like a balance problem.Hey guys ! I hope someone can help me. I have a 06 6mt with 142 000miles on it and I have shaking problem when I drive it about at 30 mph and over. On 2wd, the car is always shaking, but in 4x4 HI, the car doesn't shake when I floor it, he only shakes when I release de gas. Someone has already had this problem ?