I have a 2010 model (practically the same model).

I was trying to understand the question, did you mean the car vibrates while (Acc.) accelerating?

base on what I know and experience:

common problem is the belt tensioner and resonator... not that it has problem, but rather its quite noisy.

I personally have the noisy resonator, (when i say noisy, its like metal parts vibrating) its bothersome, I guess the innards are already worn out... I know I can just change it for a fee, but I kinda learned to live with it, considering I have an old car, and used for Coding Days. I already have it checked, Toyota says, it wont leave me stranded...

The sound/vibrations is between 2.5K - 3.5K in the RPM, while accelerating

Another suspect from other Camry owners is the belt tensioner (again, it also sounds metal parts vibrating)...

Both are wear and tear issues... i only got the sound like 5 years after i got the car.

Just my 2 cents

BTW - when i say sound, its rather loud, like diesel loud, car will actually vibrate... like the engine is very rough.... but only when accelerating.