Car does it on a full tank, half tank and near empty. It doesn't matter how much fuel I have in the tank. I thought it may be the temp out side, but it does it when its cold and hot out. I thought it may be the Air Temp Sensor, but cant find one, unless its in the MAFS. I've tried swaping it out the MAFS and even bought that MAFS sensor cleaner and no change. Ive driven the car for 75 miles with no problems, then again it would at times change from light to light. A suggestion was made to replace the entire wire harness, but really dont want to do that. I dont think its the turbo set up or the engine. Car idles like a champ, not a single miss. When she is running good, she is running goooooood. Its seems to be either a bad connection or a bad sensor somewhere, but dont know of any other sensor I can replace.