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Have a listen to this video and tell me what you think. Is this a manifold leak? Would it cause the miss, which is not very notable when cold, if at all, but is like the video once warm? This miss wasn't present last year and I haven't replaced manifold gaskets, but I do have a set.

I'd take the air cleaner off and play with the choke valve and see if getting the mixture richer will make that go away. If so, then perhaps it's just running a bit lean. See troubleshooting item #17 in your service manual.

packardinfo.com/xoops/html/downloads/servicemanual5154/Engine_IX.pdf

Thank you, that's a good suggestion! It would make sense why the "skip" appears after the car has warmed up and the choke is off. I'll let you know what I find!

I think I may still have a manifold leak as I get a bit of a pfft pfft sound, I think around #3. What's the best way to check, or is remove and inspect the best?