If it were my car, I would first do a double-dose of Techron Fuel Injector Cleaner in less than a full tank of fuel.

The 300e with 240K miles was starting rough, shuddering in warming up and starting to get poor fuel mileage. I replace the cap, rotor etc etc etc and then did the "double-dose" and now runs great.

Hey, maybe this isn't the problem but it sure is an inexpensive way to find out and your injectors are probably dirty anyway.

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)