2001 Buick Park Ave Cruise Accelerates
 

Recently Purchased a nice 2001 Park avenue with 85,000 mi in AZ and drove it to Michigan. The cruise control accelerates randomly for no known reason. Going along at 60-65 MPH and all of a sudden downshifts and accelerates until I can get my foot on the brake. I have seen other posts with similar effects but cant seem to find out what exactly is the root cause. A couple of the bulletins that were put out associated with the defect were 120901 and 030604056. I have spent hours on this and contacted many dealers to no avail. Does anyone have experience with this issue. I know it has happened a lot and there must be someone who remembers whitch part had to be reworked or, repaired. Thanxxxx,,, John