Cruise Control problems of the 2003 Chevrolet Suburban

Driving on cruise control at 45 mph. Then, we turn off cruise control, but speedometer stays at 45mph. Occurs once or twice a month. Have been stopped by the police once for driving to slow. Corrected by turning car on and off three or four times in a row.

I have 2003 Suburban 1500, that keeps getting a error message "reduce engine power". The vehicle will all of sudden while driving, reduce speed and I can't accelerate above 25-30mph. I will have to pull over and turn car off for 10-15 seconds before it resets, however it will continue to happen over and over again! it is very scary and dangerous when I have my kids or my wife drive it because you never know when the car will have this happen. Strangely, when we drive on the highway we can use the "cruise control" feature when we reach 25mph and use the cruise control to accelerate that way with minimal occurances. I have taken the car to "2 chevy dealers and 3 mechanics" nither can tell us whats wrong! this is frustrating because we only have on car, and we know this a "safety hazard" and extremly dangerous and somebody has to look into this! I only hope someone who reads these complaints has the power to help me and everyone with this problem.