this Honda has been test driven and it didn't do the shutter, however the heavy vibration at 60 to 80 is apparent. I'm told to put this, that, and the other in gas tank, does not solve it. I'm now told the torque converter is probably going out and it will cost me about $2,500 and when it goes I will stop and not be able to move the car (meaning drive). Actually, it has been almost a two year complaint, but no engine light goes on???