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So the chain rattle is due to faulty tensioners. There are three of them and you should change them all to the updated version. There is a TSB.
You should check the cam deviations. Depending on driving style you may be close to the spec limit which is +/- 6 degrees for each bank. Anything over 8 needs to be addressed asap. You can only reliably check the deviations after the engine is fully warmed up. I don’t subscribe much to using cam angle variation to assessing IMS health.
You should ask when the AOS, drive belt, spark plugs, coil packs, and water pump/thermostat were all replaced. There are updated coil packs. All the other parts are due for replacement or should be suspect.
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