No idle

I have a 1995 Camaro that doesn't want to idle.I have tried numerous things. Added Sea foam fuel treatment. New plugs. Coil packs fairly new just wasted 27 bucks on the idle control sensor which made the problem just ever so slightly better meaning it doesn't act up when running 55 as it did prior to replacing idle control sensor. Now it just does it when stopping or turning in somewhere.I have had all the electrical test. Such as Alternator, Battery, cranking amps. Etc. Everything checks good. No service engine light what so ever.T come on intentionally to make sure check engine light worked and once I plugged up what I unplugged to make it come on it reset as it's supposed to do after a couple driving cycles The car isn't dying while cruising down the road it almost like it's coughing or even better hiccuping and it's not constant.
The second you give it a little more throttle it stops doing it until the next time. It only dries when sitting still or going slow to turn in somewhere like a parking space if you don't keep the idle around 1200 it dies with in a few seconds sometime instantly unless I unplug the IAC. It idle's at 2000 rpm with it unplugged but it don't die when stopping