Living a similar problem on my '83 Euro 240d, manual. Misses a little when cold, but fine when warm. Haven't done valves yet, but believe this is most likely it. Previous owner said he did a valve adjust, but you can't do too many...

All new filters, lines look good.

Watching with interest.

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05 E320 CDI
99 SL500
02 530i

82 240D SOLD
83 240D Euro 4spd SOLD
86 300D Euro Auto SOLD