I have a 1997 Contour GL - V6/Manual 5-speed. I have 78,000 mles on it, and have replaced the rotors on one previous occasion. I am noticing the same "warped" rotor feel coming from the L/frt wheel. It started about 3 months after the last time I had the rotors turned. The previous time, the problem was corrected by turning the rotors. Now the same wheel seems to be warped again. What could be causing this problem..... Help....