Just got a Toyota Certified 2005 V6 XLE and noticed two annoying things. First during acceleration I feel a noticable vibration coming thru the gas petal, specifically when the tachometer is between 1800-2200 RPM. Also I noticed that if I take my foot off the brake pedal quickly it snaps back with a thud that can be heard even from the back seat. It seems like I can jiggle the brake pedal a bit, too. I don't remember other Toyota brake pedals doing this. I took it to my local Toyota dealer last week and they said everything was within spec and the vibration was caused by the road/tires. I don't buy this at all! Any ideas?