[Linebckr49]

first off, definitely check the IAC. and i would disassemble the whole thing, clean it inside and out, then reassemble. electric parts cleaner? brake cleaner works fine. anything with a high vapor pressure so it evaporates and doesn't linger.

secondly, although everyone likes to quickly rule-out the battery and alternator, these two components are the most common adn thusly are the most problematic. easiest way is to take your battery to autozone (or a local parts chain) and they should test it for free. they should also do this with you alternator, but its not fun removing that b/c you have to remove the belt.

but when you press the A/C button, the idle drops adn the car dies, that leads me to believe that its battery related, not alternator related. but i could be wrong b/c those two are always a sticky area as to what causes the other to do what.

so battery, IAC, then let us know.