At approximately 85K total miles, IS250 automatic began dropping from 5-6K RPM to 2-3K RPM whenever changing road grade to an incline or decline, usually above 50 mph, dropping to 35 mph on the highway. To maintain proper speed, I would have to downshift from D to S and floor the accelerator. Traction control, parking brake, and ABS lights would sometimes coincide with this problem. This continued until I sold the IS250 at 88K miles.

- Winnetka, CA, USA