I just bought an 2008 Highlander Base 2WD yesterday and have noticed a vibration while driving during certain instances. Unfortunately it is not constant and I haven't been able to make it happen on purpose. When it does happen, it occurs a second or two after I accelerate and take my foot off the pedal (when I'm not pushing the gas or slowing down). It's like the car is deciding which gear to be in...the whole thing just vibrates for 2-3 seconds. Has anyone else experienced this? If so, is it an easy fix or did I get a lemon? Thanks in advance!