I drive a '92 Lexus SC300, and recently have had some trouble with it. Sometimes when I drive it, there's a strong, cyclical pulse that you can feel throughtout the car. When this happens, the car will eventually stall when I make a turn or whenever I stop. Anyone know what this is, or what to do about it? It sucks cause the power steering turns off during a turn and the car will stall shortly after, and obviously, this could be dangerous. Thanks.