Just bought a 91 black/black several months ago. Never have I smiled so much while driving as I have in the past few months. I have not had any problems, but was curious about the typical engine sound these cars generate. As I don't know any other other owners I have nothing to compare. When driving on quiet residential streets, I hear a fast tapping sound that speeds and slows in accordance to RPMs. You can hear it at idle as well but not as loud. Curious of other's experience and what I can do about it.... If it means anything the car has 50,000 miles. Thanks in advance