similar problem with 83 380sl. replaced every fuel/vac/related part except ox sensor which seems to be ok. the fuel dist seems to be problem. i changed the top & no difference but didn't change the base/throttlebody? i think that may be the issue but haven't got ambitious enuf to change it. i've got a bunch of 380s so i pull a part from working car to try to solve problem. i've done a lot of switching. still seems to labor when cold idle/hesitate. starts fine/doesn't stall/ vac guage about1/4 over. warm it seems ok but still not quite right.