Tune up

Ok so tell me if this is possible or do I just pull the light out lol

I have a 65mm bbk TB, I built a cold air intake , headers into 2 1/4 pipes with no cats and 18" glass packs with turn downs welded to them that ends at the axles (faces my tires to warm them up)

Ok here's my problem, the AFS that was on the exhuast (4) I retapped the pipes in the right place and put the sencors back in but my engine light stays on

#2 I know a car gets set to a certain kind of driving Ex: if grandma drives the car it gets broke in to slow drivin and if grandson gets in and dogs it it won't run right,

ok lol when I got my car a couple years ago b4 I put the mods on it ran great and I put the mods on to go faster, well now it runs ok go slow but it lugs down unless I run it a fear low than it suppose to be, but if I punch the gas it runs perfect.
My dad use to race and build customs but he font wanna work on my car cus mines FI and he's old school with Carbs but he said he thinks I gotta take it to have the computer tuned to the things I did to it and it would fix my problems and take the light off

I wanna get a sct or diablo programmer but idk if it would fix it