OK I have a horibble stumble that seems to only show up after the car gets warm. Today I logged a Datamaster file, I noticed that the stumble only really started to show after the car reached closed loop. I think that I may have a slight exhaust leak where my Y-pipe meets the rest of my exhaust (prior to my O2 sensor) The stumble also seemed better today maybe because I changed out my ICM. I have the datamaster file here and can e-mail it if anyone would like to take a look and see if you can shed any light on the subject for me. Two eyes are better than one! I've been hunting this thing down for a long long time. Thanks for your help.