Q: Bad EGR code

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I already replaced the EGR valve. Cleaned the tube to the manifold. Replaced the EGR regulator. New TPS. New idle air control valve. But the code keeps showing I'm losing horse power when I step on the gas vehicle looses acceleration. There's a engine ping or knock at the bottom of vehicle. What else could be the problem??

My car has 159000 miles.
My car has an automatic transmission.

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