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I have been told that it could be lifter. Not that the lifter is bad. It is just sticking a little and the oil needs some time to pump it up. It think it may be common for when the car sits a long time.
The good thing is that it went away.
I doubt if it's piston slap. The diametrial clearance between the piston and cylinder is about .0008 inches by design. That leaves very little room for the piston to slap.
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