We have a 2001 Grand Caravan Sport with the 3.3L engine. The cruise control light will flash without pressing the cruise control button and then will either start bucking or decelerate. It will stop bucking when I let off the gas pedal or pump it a few times. A few times if has completely shut down. The cruise control light does not stay on it flashes on then off. The only code I have is the brake circuit code, I have replaced the brake switch twice. I can use the cruise control, but it will not cut out the cruise control when the brake is applied and if I turn it off it will not activate again until the engine is shut off.