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First, when you hear knocking/pinging be sure the car is in the most appropriate gear ratio by pressing even further down, "forcing" a downshift, on the gas pedal. Many drivers react to the sound of knocking/pinging by relaxing pressure on the gas pedal, something that seems instinctively correct but in this case is exactly the wrong measure.

But the effect is most likely the result of mixture being too lean, often the result of a faulty MAF/IAT sensor module. Oxygen sensors are out of the control loop during acceleration. If air filter hasn't been changed recently then do that but I would also clean/check the MAF/IAT assembly.
 
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