I have an 04 CCSB and the other day while driving up the highway going into a slight left curve the steering wheel felt like the power steering wasn't working for a second or two as I was driving out of the curve. This has happened about 6 more times since then. It is only when turning the wheel to the left and it has happened at highway speeds as well as city driving. I did find a bad tie rod end and replaced it but problem is still there. Any ideas?