fuel problem

my 87 gt feels like its got a miss at idle and driving speeds so i checked the plugs and spark and its all good... how can i check if all my injectors are firing or firing weak? could it be the fuel pump? could it be a sensor like MAP, engine coolant temp?

when you say checked your plugs, did you just look at them? A lot of times I find that people run platnium plugs in Mustangs, which I hate cause they always seem to foul out a lot.

Have you run codes yet to narrow the problem down?

yeah i took all 8 out, looked at them and regapped em at .40 and there motorcrafts. i haven't run codes yet how can i do that?