1999 Taurus transmission problem?
1999 Taurus with 168k on the car, about 88k on the transmission. The wife was driving it and said the tach was jumping about 2000 RPM while she was at highway speed (65 mph). She said the car would feel like it was slowing down when the engine surged, but them came back fine when it stopped.
I drove it yesterday for about 50 miles and nothing happened to me. I might see a 100 RPM change, but I could account for that due to load changes (wind, coming over hill, etc). The transmission fluid level is where it should be. It is due for service, but the fluid actually looks very good and has never been low. No service lights have come on.
Any ideas as to what the problem might be? What do I need to check?