uhh, check ur ignition timing too, make sure its correctly set, try taking the IAC off and carefully clean the mesh like screen with a cotton ball and some carbon cleaner stuff like spray carbon cleaner on cotton ball then whipe on the mesh dont spray the cleaner in the iac... then as GranDeos said theres a little screw on the TB and yes adjust it a little dont do alot or the car will start to preignite due to the car cant compensate adding fuel as it is after the MAP sensor... and turn it CCW. but before messing the the idle adjust screw make sure ur timing is correct and the IAC is clean...
hope that helps a bit