For almost a year after purchase, I experienced problems with gas pedal\nvibration on my Volvo C70. I took it back to the dealer many times with this\ncomplaint. They would go with me for test drives but their answer was always\nthat there was nothing abnormal about the gas pedal vibration. Hello! A gas\npedal shouldn't vibrate! That in itself is abnormal! Anyway, after taking\nthe car in for one of its regularly scheduled maintenance sessions, they\nchanged the spark plugs and I haven't had the problem since.