When vehicle is between 2nd and 3rd gear going at a consistent speed there is a vibration. vibration goes away upon acceleration. it does this as well between 4th & 5th gear. after 55mph it doesn't happen. called crest acura and was told that it is the "deactivation of cylinders and that is what it is supposed to do." i then took the vehicle to my mechanic who stated it should not do that. took vehicle to crest acura on 2/13/14 to address the blue tooth that is awful and had a technician ride with me to feel the vibration. the tech said there have been other complaints regarding the vibration but acura has not come up with a fix for it. he stated he had a call into acura. i was told once again that it is normal for the vehicle to do that by the service manager. the bluetooth complaint is: i can hear fine with it but people cant hear me. they replaced the bluetooth microphone on 2/21/14 but it did not fix the problem. i would like acura to address these 2 issues as i am not the only acura rdx customer to have these issues. a vehicle of this caliber should not vibrate! *tr