Surging really, its a common issue with cfi cars. Now the irregularities you describe are present on my 87 mgm as well but I figured it was the engine mounts. I would like to solve that too but its running pretty well and I don’t want my bad luck to rub onto this car some more lol. The ignition switch just went out too, its a great time too since I just started using it as my daily lol.
The throttle kicker is pretty much a small vacuum leak yes.
You could cap off one port on the vacuum tree at a time and the ports on the cfi itself. Just be careful if you are going to drive it like that because you will disable things like power brakes for instance.
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