Hey everyone, I got a 2000 Mustang GT.
I bought it off a guy who said it had compression issues. Turns out cylinder 2 rod was shattered. Long story short, I ended up swapping for a crate engine.

Here is my problem now, it runs rich. It first started on one side (p0172), I went one by one swapping injectors. The code jumped to bank 1 (p0175), and I replaced that injector suspecting it of leaking. Now the rich code pops on both banks (P0172+P0175).
So far I have cleaned the MAF, double checked all the electrical connections and grounds, checked O2 sensors, and checked for vacuum leaks (even though it shouldn't cause this code).

I am going to check the fuel pressure but I doubt its the problem too. What else can be causing these issues.
My OBD app shows that my trims are almost maxed out on the negatives.

 

unplug the MAF and see if the trims settle down