Is there a way to systematically test each fuel component of the w201 m103 engine 2.6? I.e., fuel pressure regulator, fuel pumps, accumulator (what does the fule accumulator do anyways?) I am having a problem to where my car will randomly shut off while stopped at a light and wont start back up. I dignosed it as a fuel problem because it cranks, and the voltage is correct on battery and all ignition components are new, but when I spray carb cleaner on the air flow plate it starts right up and dies. If I continuously spray the cleaner it runs until I stop

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1990 190E 3.0L