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Mercedes-Benz 300E Questions

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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
It just started doing this. Earlier today it would not start in either. After about 15 minutes it started in neutral.
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