1991 Mercedes-Benz 300E Questions

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I just need to know where is it is to be added at cuz I'm not sure
91 Mercedes-Benz 300e

What seems to make the problem better or worse? When engine is cold or hot
How long have you had this problem? A few weeks
cruise control wont maintain speed
there is no engine noise at all, 275000 miles. the hudraulic actuator has been replaced but now it seems worse.
my 91 300E seems to run good. I am concerned about the smell of gas . I am due for smog before Mar 8 this year. I am thinking maybe a clogged fuel filter or maybe a new one? I am not to keen when it comes to anything under the hood. I am female and just turned sixty so I could sure use a little help. Thee only other problem I had with this car is the small black rubber square that holds the muffler in place was broken and had to be replaced . I do go for reg oil changes on scheduled dates. So .. any advise on the fuel smell problem
Ran out of gas and battery died added fuel/cleaner new battery
I put a new key switch in an when turn the key everything comes on but when you get to the last turn the motor say nothing what does that mean
If I remove air filter and manually open trotle body no problem
I Have slow take off, but it does get up to speed
light on dash stays on for abs
my ignition is stuck and will not turn
I experienced short circuit on the elec fan wiring near the ABS unit while driving, and burnt some of the ABS cables. Noticed the problem when trying to make a breaking, and felt the braek failed to function just like losing break fluid. Need to know if maybe the ABS unit still can normally funtion after rewiring or have to be repair/replace. Which part of the system that maybe broken?
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