Run the highest octane you can find in your next fill up (anything 91-94 octane).
Get yourself a can of "Marvel Mystery Oil" (AKA trans fluid) and put it in with your next oil change to unstick any lash adjusters.
If the knock persists, it's something major and it doesn't matter if it's a rod, piston, or timing chain tensioner... if it's any of those, the engine will die a sudden and horrific death when it's least convenient for all... Like mine did... at Spring Zing 01... $683 and several hundred miles on a flatbad U-haul later I had my car home to Iowa... Then, I got to put a new engine in it.
Although I ended up with the first 3 Liter '98+ SE, I would have rather gone about it in a different way.
