Idle is very high

Ok, I replaced my IAC and TPS (its a 3.1 V6 91 camaro). I put it in diagnostic and kept the key on "on" for 30 seconds and unplugged the IAC. I adjusted the idle and without the IAC plugged in it idles at about 550, which is what I want, with the IAC it stays at 1500 =(. I don't understand why after I do this and plug my IAC in it stays at 1500, even after I let the IAC relearn itself. I don't think you can adjust the TPS on these cars and I can't fix my timing until I fix this idle. I had the car checked for vacuum leaks and it has none. Im desperate here, been having this problem for 4 weeks now. Can anyone offer some ideas?

Why cant you just adjust the idle back down to 550 or wherever you wanted it with the peice plugged in and forget about it?

Because my IAC (idle air control) will compensate while it is plugged in. If I lower the idle screw down while my IAC is plugged in, it will only compensate for what I just lowered. Im hoping someone else has experienced this problem and knows what the problem is.

Need this problem fixed please, anyone have an idea?

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