Affinity865

Hey guys, my daily 1991 S13 KA24de is running super rich and is only getting about 10mpg with a "leaky fuel injectors" code. I bought it this way not knowing how hard it would be to figure out the problem so I suppose that's my mistake. So far I have replaced the injectors with Deatschwerks injectors. I've replaced the stock Fuel Pressure Regulator with an adjustable Aeromotive FPR. I also replaced the wiring harness since that was super jacked up and was throwing me a knock sensor code. After all these changes I still have the check engine light, i still have the leaky injectors code, and I still have about 10 mpg. I noticed that the ECU is not the one the car came with since theres writing on it. Should i try replacing that?

I've run out of things to try so I was hoping somebody on here could give me some suggestions. I really appreciate any help you can give me.

Thanks in advance.