tapping noise

[Fastshivy]

Ok 2018 Tahoe 5.3 When you accelerate there is an intermittent tapping noise coming from the driver side (engine bay??). The dealer replaced the muffler and checked the cat and exhaust manifold bolts...It is still there but not quite as loud...Any help would be appreciated. They are stumped. It sounds like a wood pecker beating on an old hard tree.

[unfocused]

Try this. Step on the brake and accelerator. Does it make the noise or does the vehicle need to be in motion?

Also, check the rear cylinder, drivers side manifold gasket. Just a small piece blowed out will mimic this noise. Ask me how I know. Also check the collector gasket.

Edit: I have that tree and pecker in my back yard

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