I have researched most of the treads on this subject and posted many myself. Yet I have not yet found the source of my problem. I have tried different things to see if it made a difference. The last thing I have done seems to work but does not fix the problem. Maybe it will point to the problem for those in the know. When my auto has set overnite I can drive a few minutes down to the stop lite. If I have to set a moment or so it starts to stutter on again off again until the CEL comes on then when warm smooths out and runs fine the rest of the day. If I make the lite and hit the interstate the lite stays off and I can drive with no problem. I have found that if I turn the engine off when I first get to the lite and start it back up I have no stutter and no lite. Does anyone have a clue!! This has been going on for 60K miles or so.