Hi,
For open loop dc gain you should use AC simulation (Put an AC voltage source with an amplitude of, say 1). Then the ".ac" syntax (No other inputs should be used).
For ICM you should calculate it by measuring the two limits of your opamp in which all transistors are in the saturation region and ICM would be the differencr of these two values (i.e. Subtracting the largest value that the upper transistors remain in the saturation, by the smallest input voltage that the lower transistors remain in thesaturation region).
For the output swing in the open loop structure you should apply a sine input votage source with this amplitude: Vm = Vopp / Av (i.e. The required output swing voltage divided by the voltage gain). In fact the input sine frequency and the frequency you read the voltage gain should be the same.
But in most cases the closed loop swing is used since the opamp is used in feedback structures.