My m103 also felt like it was stumbling badly at idle when I got it. New plugs, cap, and rotor didn't help. Put new motor mounts in and smooth as silk. (Unfortunatly, at the time I didn't know "uro" means JUNK!) I now need to replace them with good ones.

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Some days are like licking ice cream from a spoon, today is more like trying to staple jello to a brick!
1990 300 SEL