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Thanks for the answer. The problem that I have during the simulation, in all stables modes operating correctly, only in the oscilator mode, the toggles are not constant, at some time toggles are made correctly, other times then change only Q or -Q repeatedly, in some pulses does not change either.. ...

I have the same problem with FF jk, there are errors in the outputs when I put in oscillator mode. I do not know if it has to do with the delay times in the models of the gates. I've been reading in the forums and find no answer.

This is the circuit I am testing.

Hopefully you can help me, Thanks!