I have a potential problem with my newly purchased Sven. The car has 140k on it with timing belt/accessories changed as well as a pretty immaculate interior. I have recently discovered that when I am driving, there seems to be vibrating/whining when I let off the accelerator. If I keep my foot rested on the accelerator I can feel the vibrations. Also, it is not a constant vibration but more like pulsating. I don't notice it at high speeds maybe because of road noise, etc. The tranny shifts smoothly and I only notice the problem at around 20-30 mph. Maybe some of you experienced owners can help a new (potentially paranoid) owner? This is my first Volvo so I don't have much experience with driving them other than the 6 or 7 test drives I went on but I don't remember hearing/feeling this particular problem.

Sorry about the long post but I hope to take this car out of town about 150 miles this weekend, Thanks!