Hello,
Any news this matter what caused the vibrations?
I have exactly the same problem with my Honda Accord 2.4 -03 CL9 (exactly the same as Acura TSX). But I also feel a small wobble from the front end when accelarating around 1800-2200 rpm in 1st 2nd and 3rd gear. I have changed only the driver side drive shaft but with no luck... I heard that the driver side were more abused.. so I wonder if I should change the other side as well.