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There are no "extra parts" on a benz (well, except perhaps the cup holders) that you can do without.
Fix your problems in paragraph 3, and that will lead to the problem in paragraph 2 going away.
Tackle each system and sub system one at a time so that it works and works well. There is a good, general order to do these things...
- Always make sure the ignition is good (timed right, plugs right, etc). before
- Work out the details of the fuel pressure and delivery before
- Getting idle behavior correct
- Getting running behavior correct
Don't discount wiring problems which will have sensors do the wrong thing or vacuum leaks which will cause all sorts of controls to misbehave.
Note that these rules apply to ALL the mercedes I've ever worked on (cars since the 50s). The difference from year to year is the complexity of each task and the tools required.
-CTH
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