Q: Van jumps forward on the drive gear

asked by on October 17, 2016

Had Van checked by a mechanic. It had been overheating and was leaking steering power fluid. Also it jumps forward making a hard thumping sound. New water and power steering pumps were installed by the mechanic. But problems continue: 1. Still leaks power steering power fluid. 2. Van continues leaping forward when drive gear is engaged. What could be the cause?

My car has 150000 miles.
My car has an automatic transmission.

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