2003 GMC YUKON XL DENALI Engine Problems

WE WERE DRIVING UP IN THE MOUNTAINS AND WE LOST POWER BRIEFLY TO THE ENGINE. THE LIGHTS FLICKERED AND THE DASH BOARD WENT OUT. THEN THE LOSS OF ENGINE POWER CAME ON AND THE STABILITY/TRACTION CAME ON TOO. THIS HAS HAPPENED WEEKLY FOR THE LAST TWO YEARS. THIS LAST TIME WAS ALARMING SINCE WE WERE COMING DOWN A MOUNTAIN IN A STORM AND COULD HAVE BEEN STRANDED UP THERE WITH NO RUNNING VEHICLE TO KEEP US WARM. THIS NEEDS TO GET A RECALL OR INVESTIGATION GOING ON THESE VEHICLES. IF YOU GOOGLE THIS ISSUE YOU WILL SEE THAT THERE ARE HUNDREDS IF NOT THOUSANDS OF PEOPLE THAT ARE AFFECTED WITH THIS ISSUE. IT WILL KILL PEOPLE IF THEY EXPECT TO HAVE POWER TO GET THROUGH AN INTERSECTION FAST ENOUGH AND THE VEHICLE GIVES OUT ON THEM. *TR

DRIVING 65 MPH ON THE HIGHWAY AND ALL OF A SUDDEN MY CAR LOSES POWER. THIS IS VERY DANGEROUS! THE DASH SAYS REDUCED ENGINE POWER. ENGINE LIGHT COMES ON. CODES FOR THE PROBLEM P0120, P0171, P0174, P0300, P2135. I GOT EVERYTHING DONE THAT WAS SUGGESTED THE CODES ARE GONE AND IT'S STILL HAPPENING!! NOT SURE WHAT THE GMC DEALERSHIP IS UP TO BUT THEY DON'T HAVE A CLUE TO WHAT'S CAUSING IT OR HOW TO FIX IT! *TR