Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
Re: bad engine shake
I may have misunderstood your shaking. I was thinking of a bad shake like an out of balance washing machine. If yours is a mild shake and it runs pretty good.........it could still be the points; especially if you don't know when they were last changed. They do have to be adjusted so you either need some old guy to do it or read up some old manuals.
They looked pretty dirty, but the rotor and inside the cap were clean though. They're all cheap parts so I'm gonna do all three. My neighbor said hed help me adjust em. I'll report back when they're done.
I had the same problem, turned out to be a worn throttle shaft bore in the carb base plate.
Even tiny play will allow additional air into the engine causing rough idle and/or stalling.
-> carb overhaul
You could also check torque on carb and intake manifold bolts.
Worn carb gaskets may cause leaks as well.