2001 MERCEDES BENZ ML430 Power Train Problems

I WAS DRIVING HOME CAME TO A CURVE IN THE ROAD ABOUT 15 MPH THE CAR STARTED TO JERK AS IF THE BRAKES WERE BEING ENGAGED, I PULLED OVER TURNED THE CAR OFF TURNED IT BACK ON THE ESP-BAS LIGHT CAME ON. EVER SINCE THEN THE CAR IS UNPREDICTABLE IT HAPPENS EVERYDAY BUT WHEN IT WANTS TO. *TR

IN APPROXIMATELY AUGUST 2010, I HAD AN ESP LIGHT ON. TOOK IT TO THE DEALERSHIP (3 HOURS AWAY) AND THEY REPLACED THE STEERING COLUMN. I PICKED UP THE CAR AND DROVE APPROX 20 MINS WHEN I NOTICED THE STEERING WHEEL WAS NOT ALIGNED. CALLED THE DEALERSHIP AND HAD TO BRING IT BACK IN BECAUSE THEY FORGOT TO ALIGN THE WHEELS. STARTED OFF ON MY DRIVE BACK HOME, STOPPED FOR GAS AND ON THE WAY OUT THE DRIVEWAY (10 MPH), I HEARD A GRINDING/SQUEAKING NOISE. GOT MY CAR HOME AND FOUND THAT IT WAS LEAKING POWER STEERING FLUID FROM A CLAMP. I KEPT PS FLUID IN THE CAR. TOOK THE CAR BACK TO THE DEALERSHIP IN APPROX. NOVEMBER AND THEY TOLD ME THAT I NEEDED TO HAVE A NEW PS PUMP AND RACK/PINIONS RESEALED, THE COST OF APPROX $1800.00, OF WHICH I CANNOT AFFORD. I HAVE BEEN DRIVING THE CAR, JUST...