nissan 300 zx z31
 

NISSAN 300ZX Z31 from 1985. atmospheric engine V6, 3 liters - automatic speed with overdrive.
I've been driving at steady speed (50-55 mph -80/90kmh)
when suddenly the SRPM went to 0 and the engine stopped.
Two times the engine restarted for a short time, but since then, nothing.
The fuel admission is correct.
The starter turns normally.
There are no sparks at the plugs.
I unfortunately don't have the circuit diagram.
Could anyone give me an idea about the reason of the breakdown or provide a circuit diagram?

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