I have this same issue. You can only feel it under high load in higher gears like when flooring it in 5th or 6th on the highway once the boost builds up. Dealer could not reproduce the issue. I think it could be something on the driveshaft linkage like the guibo or center bearing. I have not seen any misfire codes and have brand new plugs. I also get a whine from the read when coasting in 4th at 2500 RPM. The dealer says its the differential. I dont know if they are related at all.
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