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Q:

what causes engine to miss on 1994 Mercedes-Benz E420

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine misses slow speed/rpm. could it be fuel filter? Or needing tuneup?
(1) Answer
I would look at the ignition system, spark plugs, cap, rotor and wires. Also, check for vacuum leaks.