Vehicle is a 1980 U.S. 450SEL.
Symptom is rough idle, stumble when accel from a stop until engine warm.
Clean dist cap and rotor. Problem temporarily resolved. I have found over the years that the distributor cap and rotor need to be replaced about every 45,000 miles. Burned conductors on the cap (all 8).
Is that normal?
S, J.R. Brown
2000 G500 LWB Obsedian Black
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1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)