I just bought at 2001 V70 XC (1 year ago) and have noticed that for the last few months I have been having vibration issues with the car as I go from 60 to 70mph. The vibration pretty much disappears right at 70mph. I had the tires replaced, then had them balanced, rotated and aligned. Still have the vibration issue. The whole car seems to shake as the engine concentrates at those speeds. It is only during acceleration because if you take your foot of the gas, no shaking or vibration. Any suggestions before I take it to my local Volvo dealer and get taken to the cleaners?