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I got a 1993 subaru impreza (1.8l engine)

the other day I took my car on a rocky gravel road and when I was done I notice a knocking noise comming from the engine I was thinking it was a rocker arm loose but after playin with it I notices it only makes a noise when the throttle is open wide its completely quiet if the throttle is closed no matter what the engine speed is at could it still be a rocker arm or something else?

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