1994 NISSAN 300 ZX N/A ROUGH IDLE
Rough idle can be caused by many things.
Some of the more common things are vacuum leak, burned exhaust or intake valve, worn camshaft, poor valve adjustment, fuel injector(s), ignition parts like cap, rotor, wires, plugs, fuel pump and fuel pressure out of range and clogged fuel filter, lean fuel mixture, head gasket, the list can go on.
Check all vacuum lines and take a compression test of the engine cylinders to start with.
Get back to us with more detailed information on what you found and we can go on from there.