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1991 Chevy Lumina 3.1 V6 engine (139k miles) tapping and misfiring

Out of no where a couple months ago my Lumina started making a tapping noise which seems relatively inconsistent and misfires with every tap. it hasn’t really been driven at all since but it has been started several times. The engine only has 139k on it and seems to have been maintained fairly alright over all of it’s owners. I fear it may be a rod knocking but I want to be absolutely sure. I have a few videos of it and one video that has a different noise it was making before the tapping started, maybe it has something to do with that.

http://www.mediafire.com/file/4w1rwxcfh6hlwfu/VID_20200310_174454770.mp4/file
http://www.mediafire.com/file/vqxq784pplsofpm/VID_20200310_174615756_1024x576.mp4/file

Tapping noise, not sure if you can hear the misfire but it’s there.

http://www.mediafire.com/file/dnh4w5o800pq628/VID_20200220_202317098.mp4/file

Noise before hand, only happens under moderate acceleration.
Couldn’t put this in the main topic cause I’m a “new user”.