I have a 1986 Nissan 300 ZX for contacts I did not change head gaskets as I stated I was trying to do in previous post I did replace the thermostat, spark plugs, distributor, cap, rotor wires, ignition coil, as well as the starter

So the car currently is able to crank, but it does not fire. I sprayed some starter fluid into the throttle body and it wouldn’t turn on. It’s not a problem. I hear the fuel pump. I don’t believe it’s a spark plug issue since I replaced all of the spark and I don’t think it’s air since I replaced some of the vacuum hoses so I’m confused and what it can be and was wondering if anyone knew what can cause my car to not start