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Based on your description I would say timing chain guides. There are several guides on the 2002 and earlier engines. These engines typically have increased wear on the guides for the intake/exhaust cams. They flake off in bits and will eventually fail. Best thing to do is keep an eye on it and monitor your cam deviations. Anything over +/- 6 degrees on either side is out of spec. One side may wear more significantly and should be cause for concern and service.
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