Originally Posted by Bakeoff
sounds goofy, but one thing that will kill your idle is the hose that runs from the bottom of the pcv valve. if it isn't connected back to the box on the back of the block, your idle is going to be chunky as hell... Other than that, Jafro has it pretty well covered.
That was my first thought, PCV valve. Also might want to see if the IACV is clogged.