ticking/knocking noise
 

>> Hi, i have an isuzu trooper 2000, with 73k miles,I have a ticking/knocking noise which i hear at about 2500-4000 rpm, can hear it in neutral when pressing gas pedal. One mechanic told me lower engine noise, someone told me possibly loose pedastall in rocker assembly arm. Here is a video, any ideas, thanks.

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