the way the engine comes down from an idle I would check the for a lean condition. First check the big vacum port in the back of the carb. Next I would bring the car at a fast idle and check for gas dripping at all four boosters. The last thing I would check would be the firing order espically the, 5 and 7 plug wires i have crossed these before and the car still runs but does not idle. next is pull the spark plug and check for oil (cracked pistion) or a closed gap (left over junk in the cylinder).
After all else fails the next thing I would suspect is a bent pushrod or bad lifter damaged by the pistion contacting the valve when it was stuck open. Because if the intake valve opens too early or is opened slightly, exhaust will enter the intake manifold and cause a lean condition. A bad hydralic lifter can still give you good compression readings
Ive been there too,
hope this helps
chevysteve2