Finally was able to get car coded after terrible idle and running issue

code :48 maf( which was unplugged)
code :32 egr system
code :64 02 sensor too lean
code :18 injector circuit

states : 2 injectors at 12:6 rest around 13:1


quoted $1700 for repair which of course I’m going to do what I can myself first
95 lt1 camaro


anybody have similar issues or have had ?