Since I've owned the Benz, its had a rough idle and sometimes a knock here and there. I purchased new Monarch nozzles form Mercedes Source and rebuilt my injectors following the procedure in Kent's guide.
Testing each injector with the hand pump on my work bench, I found one injector was squirting like a cheap dollar store water gun, rather than misting correctly.
Old dirty nozzles
After the rebuild and balancing of the injectors, my engine runs smoother than it ever has. Also, there is no noticeable smoking at startup!
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