Engine Malfunction help!

I need some help with this issue...please!

My engine light is on, and my engine doesnt want idle normally. instead, when I turn the car on the first seconds it works fine then the rpms jump around a bit and it dies out.
the only code i'm getting is P0102. I replaced the maf sensor with another, no luck. Engine dies out with or w/o the maf sensor plugged in...does anyone know what else might be causing this? gas pump works fine aswell.
Another thing Someone cut my plug off from the wiring to the maf sensor so i made a custom plug instead of paying 1000.00 for new engine bay wiring, unrelated?