Vibration in Gas pedal

I have 2000 Honda Accord, While driving at 38-43 mph there is vibration in my gas pedal, as i leave the pedal vibration goes. after speed comes down to say around 35mph if i apply it again there is no vibration in my gas pedal. At times car is running at 38-43mph and i apply gas pedal then again it vibrates which is very evident to the passengers as well.there is no real sound but the vibration is very evident.this does not happens always but it's quite frequent, I'm not sure what is causing it? any suggestions would be of great help.

It's possible you have a bad CV joint.