2013 AUDI A3 Vehicle Speed Control Problems

2013 AUDI A3 TDI., SERVICED FOR 65K MAINTENANCE 10/31/15. NEXT DAY , THE CAR BEGAN ABRUPTLY LOOSING FORWARD MOMENTUM UNDER ACCELERATION, AND DIED IN AN INTERSECTION. TOWED TO AUDI, AND THEY TOLD ME IT WAS BAD DIESEL. THEY FLUSHED THE DIESEL AND REPLACED THE FUEL PUMP. (KROGER DENIED MY BAD DIESEL CLAIM.) ON 11/2/15, THE CHECK ENGINE LIGHT CAME ON, SAME ISSUES. DEALER TOLD ME IT WAS THE ENGINE SPEED SENSOR AND REPLACED IT. ONE MONTH LATER, 11/6/15, MY CHECK ENGINE LIGHT CAME ON AGAIN, WITH THE GLOW PLUG LIGHT FLASHING. THIS TIME THE DEALER SAID IT IS WAS THROTTLE SENSOR FAULT. THEY HAD TO ORDER THE PART, AND TOLD ME IT WAS 'SAFE TO DRIVE'. IN THE TIME BETWEEN, I WOULD REGULARLY EXPERIENCE THE LOSS OF FORWARD MOMENTUM WHILE ACCELERATING UP HILLS. I HAD THE WORK DONE 1/7/16. 9 DAYS LATER AFTER THE THROTTLE SENSOR REPLACEMENT, SATURDAY, 1/16/16, WHILE...