I have a problem with my car's idle, when I first start it cold the idle jumps up and down. If I give it a little throttle for about 1 min the idle seems to steady down and once warm idle seems fine. Also running down the road at a steady throttle there seems to be a miss or stumble at irregular times. Using Winaldl I have noticed that the IAC #'s run about 140-80 for the first minute or so then starts a slow descent down to about 30 when warm, but every once in awhile it jumps up to 120 and then slowly goes back to the 30's over about a minute. Hope someone can help me with this it is driving me crazy. thanks

 

Id suggest cleaning the IAC for starters. See if that helps. An IAC that lags behind can cause problems.