WHILE DRIVING VAN GOING UP A SLIGHT INCLINE THE VAN ACCELERATED SLIGHTLY. WHEN TAPPING THE BRAKE THE VAN WENT INTO FULL POWER. THERE WAS SO MUCH TORQUE IN THE REAR WHEEL, THE VAN WENT INTO A SPIN AND HIT A DITCH. VAN WAS TOWED TO A BODY SHOP. BODY SHOP CLEANED BALL JOINT ON ACCELERATOR CABLE WHICH WAS ACCUMULATED WITH RUST BUILD UP BELIEVED TO BE CAUSE OF PROBLEM. *AK *SLC