2011 Ford Flex

MY 2011 FORD FLEX IS BACK AT THE DEALERSHIP AFTER THREE TURBOS BEING REPLACED ON IT'S 3.5 LITER ECOBOOST ENGINE. OUR VEHICLE WAS AT THE DELERAHIP FOR A MONTH AND WE JUST GOT IT BACK ON THURSDAY. ON SATURDAY I WAS ON THE HIGHWAY WHEN IT BEGAN SHUTTERING AND JUST DIED. I WAS LEFT POWERLESS IN THE LEFT LANE OF A FOUR LANE HIGHWAY AND HAD TO MANUVER ACROSS THREE LANES TO GET TO THE SHOULDER WITH THREE CHILDREN ON BOARD. VEHICLE WOULD NOT RESTART AND WHILE TURNING THE KEY WHITE SMOKE BILLOWING FROM UNDER THE HOOD. VERY STRONG SMELL OF ELECTRICAL BURNING. I THOUGHT IT WA GOING TO CATCH ON FIRE AND HAD THE CHILDREN GET OUT OF THE VEHICLE ON THE SIDE OF A VERY BUSY HIGHWAY. THIS IS THE THIRD TIME AT THE DEALERSHIP FOR THIS CAR WITH ENGINE PROBLEMS. PLEASE ADVISE ON WHAT COURSE OF ACTION I NEED TO TAKE SO THIS DEFECTIVE ENGINE DOES NOT CAUSE DEATH OR INJURY.

UPON ACCELERATION, USUALLY FROM A COMPLETE STOP SUCH AS ACCELERATING FROM A STOP SIGN OR ON A GREEN LIGHT, IT FEELS AS THOUGH THE GEARS DO NO CATCH & THE CAR JERKS AND THE RPM'S RAISE BUT THE CAR STOPS ACCELERATING. WILL ALSO HAVE A "STUTTERING" OR "JERKING" WHILE AT A COMPLETE STOP WITH BREAK PEDAL BEING PRESSED DOWN. I HAVE TAKEN THIS ISSUE TO THE DEALERSHIP AS IT IS STILL UNDER EXTENDED WARRANTY AND HAVE BEEN TOLD THAT EVERYTHING CHECKED OUT NORMAL & THE MECHANIC AT THE DEALERSHIP WAS UNABLE TO GET THE VEHICLE TO HAVE SUCH DESCRIBED MALFUNCTIONS BECAUSE IT IS DOESN'T HAPPEN EVERY SINGLE TIME THE CAR IS DRIVEN. THE JERKING WHILE DRIVING ACTUALLY OCCURS ON A DAILY BASIS BUT IS SPORADIC & CAN JERK YOU FORWARD DUE TO THE SUDDEN LOSS OF ACCELERATION CAPABILITY, STARTLING AND PAINFUL BECAUSE THE SEATBELT MECHANISM HAS ENGAGED IN THE PAST.