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The material that the gas pedal is made of has one Hell of a resonance to certain vibrations. Between about 450 miles and 800 miles on my odometer my gas pedal would follow the engine thru the range with high frequency vibration as the truck shifted. At 70 mph the gas pedal buzz would tickle my foot, and was just becoming audible. More than 70, it would fade away. I made sure never to keep it in that range for long or at any speed for vey long, while breaking in. I was close to bringing it in, but a tech on the phone said "give it a while, it's just breaking in."
After 800 miles it started to fade out, after 1100 miles it's gone. At first I had thought that it was strange for my gas pedal to exhibit vibration, as there is no solid throttle link to transmit vibration from the motor/drive train and there was no vibration in the floorboard.
But, if someone that has some throat to their exhaust passes me in traffic, once more, I can feel it in that gas pedal, a very strong resonance. It was hard to get used to.
My point is, keep at them about it. You have vibration from somewhere in your drive train and that gas pedal is picking it up.
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