my 04 vw beetle is making a tapping noise only after idling for a long time. if i give it gas it…

my 04 vw beetle is making a tapping noise only after idling for a long time. if i give it gas it stops ticking. here is a link to the video with the sound its making. https://youtu.be/1pc09Iys2Nw
what could it be? thanks Scotty!

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