Make sure the vacuum lines are correctly installed, as per Mercedes or Haynes manual. Also check the correct gap for the throttle dashpot/linkage (this has a vacuum line at the top of it.)
I madde sure all vacuum lines were in the correct location and I also noticed a broken vacuum line and thought this might be what was causing all my trouble, I fixed it but it didn't make much of a difference. What I did realize today though is that when the engine temperature gets a little below 175 degree mark on the temperature gage it dies, It runs a little rough up until that temperature then right around the same area on the temp gage it always starts sputtering then dies. I also noticed that when I give it a little gas it makes a sort of hissing sound somewhere in the engine, could that be part of the problem, I've checked all visible vacuum lines for leaks and have only found 1 which I fixed. Could it be something to do with the sensors, I've played with those a little but it didn't make much of a difference.
I finally got the 250 running, I replaced pretty much the whole ignition system, everything except the condenser and that has seemed to fix all the problems I mentioned in this post. I saw a 114 at the salvage yard and decided to just take the condenser for the heck of it so I put it on my car when I got home and started her right up no problems like before such as stalling or hesitation. Just thought I'd share the solution to this problem which puzzled me for a long while. Now it's off to the bodyshop for the ol' girl
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When the going gets weird, the weird turn pro.
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