1974 2.0 Stock except for Crane FireBall 3000 electronic ignition, all FI parts NOS or 2 years New.

I am getting a momentary small miss/skip at RPM's of approx. 3200 and 3800 randomly not always but usually when I am at a maintained constant speed.

Any hints at what I should look at as a cause? It is slight but disconcering..

I have look most things over and there are no obvious tells..

Also another issue of RPM at idle dropping more than usual when headlights are on? a hint or possible seperate issue?

New plugs and wires, fuel filter, air filter, oil, oil filter, trans oil.. and CHT

Recent fix/ replced seals of vaccum leaks at the injectors..

Also reset timming and mixture ect..

clean/lube distributor components. trigger points