Hello everyone, I had the same problem with my 09 big horn edition (5.7 hemi). It started as a slight vibration in the gas pedal, usually at 35-45 mp, and gradually got worse, till it was a surging vibration, felt through the gas pedal, floorboard, steering wheel etc. when I got my first oil change I asked the tech to drive it, he felt it as well and asked me to bring it back the following day. He spend all day looking for the problem, and finally found out that it was a bad axle bearing. He changed it out the next day, and vibration is gone. I called and talked to the service manager a couple weeks prior, and asked about the vibration, and he gave me the harmonics talk, and also said it was part of the electronic throttle, and said it was normal. But this isnt normal, maybe they got a bad batch of bearings, and we all have the same issue. So if you guys are still having vibration issues, i suggest taking it to the dealer, and telling them to look at your axle bearing. It definitely fixed my issue. I hope this helps.
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