Hi everyone,
I have found many posts with people experiencing the same problem as I but it seems nobody over there has solved it -- not to mention the threads are almost 4 years old.

Anyway, here is my problem: The 1985 500 SEL starts up and runs fantastically until it gets warm. Once up to temperature, the idle becomes rough and choppy... like it's missing a cylinder or something. It remains choppy for the first few seconds of acceleration and then it smooths right out. As soon as it stops at a light or something, the rough idle and choppiness comes right back. I have changed the plugs, wires, dist. cap, rotor, O2 sensor, and given it a general tune up.

Some posts i have found suggest one of the injectors could be bad, but i just pulled the plugs looking for one that may be fouled and all of them look clean and proper like they are burning fuel correctly. I have also seen suggestions that it may be a vacuum leak, but all of my lines seem to be in order.

This is driving me nuts, and apparently it has driven others nuts too. I am just wondering if anybody may have come across something i missed and perhaps has a more narrow idea of the culprit and how to fix it.

Any help will be greatly appreciated.

Thank you all!

__________________
1985 500 SEL
170K - Near perfect condition!
---my MB is my baby!---