I've seen that phrase used alot but not quite sure what its referring to. My car, at idle, after it warms up and goes into closed loop will stumble if you "goose" the throttle a bit, sometimes even die. While upon cold start up in open loop, no hesitation/stumble at all. I've cleaned tb, set the tps and iac both within range, BLMs at 128 i believe, noticed that the MAF that was on it had no screens in it, so i replaced with a remanned one that has the two screens. No change. Car has a red armstrong computer and chip combo from like 03, i've heard those are junk and outdated now....replace them with a factory computer and maybe a turbo tweak chip?? It's got 55lb injectors. HEELLLLLLLPPPPPPP! this is getting frustrating.