My 1991 190E 2.6 is running rough at idle and low rpms. Once you get to 1200 RPM or so it smooths out, sometimes it idles smooth as well. It idles very rough at startup and then generally smooths out after 3-4 seconds.

Had 60k service just 4 months ago (problem existed before this) and the plugs were changed as well as all of the other items.

Is there a way to tell if this is wires or injectors? Injector cleaner doesn't help but they could still be injecting without atomizing correctly due to age, etc.

brookspw

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