Help! My car stutters.
 

Please, Please, Help.

it's a 2 litre 190e from 1983 with auto, with 175 000km
It's all fine when cold, but once it's well warmed up and I wish to accelerate at any speed in any gear the stutters and misfires and does bucking bronco impressions. What is going on? Could it be that the injectors have had it , because one was already changed. It can not be the fuel because I tried differnt types.

Please help

toby