High consumption in goal GTI 92

It consumes a lot of fuel, starts roughly, and emits black smoke. I tuned it up, checked the temperature sensor, removed the entire intake manifold and replaced all the gaskets, O-rings, etc., changed the spark plugs and wires, checked the fuel pump (good), checked the injectors (good), I did a vacuum test on the intake pressure sensor integrated into the ECU and it doesn't produce any change in the engine speed, and I have doubts about the operation of the (duplicate) temperature sensor. I would appreciate any help.

O2 sensor

This car doesn't have a lambda sensor, but it does have a resistor on each injector. What is their function? Can they increase the injection pulse if they're not working?

It could also be the MAF sensor, since the exhaust color indicates an overly rich mixture and that the ECU isn't sending the correct signals to the fuel injection system. As for the resistors, they're generally used to reduce voltage.