Do i need injectors

[SmokinStangGT]

I have an 89' Mustang GT that was extremly fast for only having a few things done to it. But this winter i wanted to rebuild it and get more power because it had many miles on it and i just need more power. Anyway i took out the motor, honed it, cleaned it ported and polished the heads and unpper and lower intake, got a 70 mm throttle body with egr backplate, i pu in keith black 12:1 compression pistons with sealed power rings and all new fel pro bearings and a nice big comp. cam. All of it was done correctly and everything is new inside so it should be fine. one problem, i doesnt idle. I give it just a little gass and in the upper rpm range it sounds good and runs powerful but when i let it go to idle it shakes and stalls. i took it in and had it timed then it worked good but next day it didnt. i have the stokc injectors in it, do you think i nneed bigger or could the problem not be the injectors and more like wires? -thanks