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Mercedes-Benz 300E Questions

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Is full of gas, new battery, was driving good all day stop at the store and now it won’t stay on. Turn key it start but then turns off. Need help!!
I just need to know where is it is to be added at cuz I'm not sure
2 nd gear will slip then went i let up on gas pedal it will shift ??
I AM LOOKING TO PURCHASE ONE OF TWO CARS THEY ARE BOTH MERCEDES BENZ 1ST. ONE IS A 1992 300E AND THE 2ND IS 1992 220E BOTH HAVE AROUND 145000 KMS ON THE CLOCK IN YOUR OPINION WHICH CAR IS THE BETTER OS THE TWO THANKYOU
Central locking system does not work, vacuum pump works when I put power direct to the motor. Neither driver or passenger side door works.
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
Car shuts down after it gets warmed up won't start until cooled
coil pack not working
car was running and all of an sudden I lose spark plug fire
I added about a 1/2 bottle of new stuff and it worked fine But Ive never seen that in a car before I am going to flush it out Where is the plug Im assuming right underneath it?
New spark plugs and battery only and gas. Ordered a fuel pump although
Goes up and down. Car has 239k and is ready to go in for 3k oil change.
It has 165000 miles on it, it was sitting for a couple of years before I purchased it. After driving for a month it started making loud noise and stalling. took it to a local mechanic shop and they said engine is gone, has to be replaced. is it possible to trouble shoot all vital parts like transmission, water tank and everything else and restore the car so it will run without giving trouble? How much that kind of work can cost??
started right up and ran fine. now all of a sudden it just turns over and wont start. please help
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