Hello everyone,
I have a 420sel that is missing and I can't seem to put my finger on it. I tried to search the archives and came up with nothing, so if this is a repost I apologize.

What is happening: At low RPM the engine has a shudder at intervals. I've changed the spark plugs (used copper plugs) and it's still there. It is more pronounced when it is colder out, therefore I believe it's electrical. I was thinking perhaps the wires need changed? I'd like to check the resistance of the wires and the plug connectors, does anyone know what these should be?

Anyway, the shudder comes and goes, and after driving at highway speeds the shudder isn't nearly as bad.

Thanks in advance!

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1988 420sel