In the morning or when the engine isnt warmed up when i stop at a light my rpms will drop really low and sometimes stall any clue? thanks. Oh i replaced my iac but no change

 

Make sure the MAF element is clean.You can spray it with electrical contact cleaner or use alcohol and a cotton swab.Be carefull,the element in these things is fragile.

 

chopper guessed same as I would. start there.

 

Did you unhook the battery when you replaced the IAC? If you did, then another vote for oily MAF element. If there are any other driveability problems, then it could be small vacuum leak but from your description, it sounds like only when cold and only at idle.