2000 Buick Regal Transmission Problems. Car has a perfectly clean vehicle history report. Bad modulators may also cause this problem.
Transmission and drivetrain (8%) brakes and traction control (5%) suspension and steering (10%) electrical and air conditioning (24%) paint, rust, leaks, rattles, and trim (15%) other (4%) chart based on 293 repairs. Since then, the car has a stumble or shudder in the transmission (i think) at 45 to 75 mph when it is accelerated slightly going up hill. Sometimes there is a slight hesitation as well when at highway speeds and you try to accelerate.