rough idle dying under 1k rpms

[notomorrow]

2000 alero, 2.4l auto, has a really really rough idle, was led to believe it had something to do with ignition, ive replaced a cracked coil pack housing, spark plugs, boots, had the icm tested and it was bad, replaced with one that tested good, still rough idling, im about to switch out the coil packs with another pair and see but i doubt it will work... only other option i can think of now is the IAT...but im unsure how to test this, and i cant afford to just throw parts at the car anymore... please help, i love this car and i dont want to get rid of it, but ive been frustrated for a year and a few months now...