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The 300E tends to do this when I haven't run Techron or other fuel injector cleaner through in some time. Afterwards the problem seems to disappear. I always regarded the problem as leaking injectors or bad spray patterns.
If you haven't run a cleaner through in a long time, you might want to try the infamous double-dose of Techron in less than a full tank of fuel. It is recommended you change the oil and filter afterwards.
The following are obvious but have all of you checked your caps and rotors recently? Plugs? What kind of plugs?
Keep us posted,
Haasman
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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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