I have an intermittent problem with my power steering; when the the engine is at or close to idle (900 - 1100 rpms) the power steering doesn't work. As I said it's intermittent, most of the time it's fine, but sometimes it's not and taking a low speed, tight turn and suddenly not having power steering is a major safety concern. I checked the fluid level, it's fine. There don't appear to be any leaks. Also, the power steering pump was replaced in 2005, 20,000 miles ago. I must admit that the first time I noticed this problem was after I did something stupid and over revved the engine. (I've owned the car for over 5 years, first time making a mistake like that, I assure you.) Did I damage the pump? If not, any ideas of what it could be? Thanks in advance.