when i'm cruising around 50mph, every once in a while my car will stutter for a couple seconds (kinda feels like it's not firing correctly.) i just installed a apexi safc last week and it was running great. i was planning on using it for the hack when i get the turbo in a couple weeks. so i went ahead and installed it now, so i wouldn't have to do it later on. but then i reset the afc (bought it slightly used) and this problem started happening. i set all the settings on the afc for my car, but now i've got this problem. i've checked the plugs, wires, rotor, and cap and it seems fine, but i can't figure out what is making my car do this. anyone know what it is?
these are my afc settings...
sensor - pressure, 6 in, 6 out
4 cylinder with the arrow pointing to the upper right
hi throttle- 75%
lo throttle- 50%
fuel is set at zero percent across the band.
everything else i left alone

can anyone help me?

 

If your plugs, wires, cap, and rotor are all fine, maybe its just a bad tank of gas.