2008 GMC Yukon Denali Xl

DRIVING AT 70 MPH ON HIGHWAY. VEHICLE GAUGES BEGIN TO ACT ERRATICALLY, VEHICLE HEAVES AND LURCHES, THEN 100% POWER FAILURE. NOTHING WORKED, EVEN HAZZARD LIGHTS. AIRBAG LIGHT FLASHING ON AND OFF. WAS ABLE TO PUT VEHICLE IN NEUTRAL AND MOVE TO THE SIDE OF THE ROAD WHERE THE VEHICLE STOPPED. THERE WAS NO POWER AT ALL, HAD TO MANUALLY OPEN DOOR LOCKS. AFTER 10-15 MINUTES, THE POWER CAME BACK ON AND I WAS ABLE TO RESTART THE VEHICLE AND DRIVE HOME. HAPPENED AGAIN ON 3/23/14. AGAIN DRIVING AT HIGHWAY SPEEDS, THE ELECTRIC COMPONENTS (RADIO, GAUGES, POWER CORD ACCESSORIES) BEGIN ACTING ERRATICALLY AND THEN 100% COMPLETE POWER FAILURE WHILE DRIVING. THE GM DEALER CANNOT DUPLICATE OR FIND THE PROBLEM. I FEEL 100% UNSAFE IN THE VEHICLE ESPECIALLY WITH MY KIDS. *TR

WAS WAITING FOR A RED LIGHT TO CHANGE AND SUDDENLY MY DASHBOARD LIT UP SAYING IT WAS REDUCING POWER TO THE ENGINE, DISABLING STABILITY CONTROL AND SOMETHING ELSE.. I WAS NOT ABLE TO DRIVE THE CAR FOR FOR 2 HOURS AFTER THAT... I.GOT THE CAR TOWED TO MY HOUSE AND WHEN I WENT BACK TO FALLOWING MORNING THE CAR STARTED WITH OUT THE ENGINE LIGHT ON..2 DAYS AFTER THE SAME THING HAPPENED WHILE DRIVING ON THE HIGHWAY AT 65 MPH, IT WAS A SCARY EXPERIENCE SINCE THE CAR REDUCED POWER VERY FAST TO 20 MPH.. ALMOST GOT INTO AN ACCIDENT. *TT