What causing nocking noise from the engin when you press on gas paddle on 1997 Lexus LX450

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There is nocking or tapping noise frome the engin as soon you start the engin and as you press on gas higer noise comes. I want to know what is causing the this or is it repairable.
(1) Answer
sounds like your the engine has rod knock ..not good can be from lack of oil and oil pressure have checked oil lately?