If the car only misses when the engine is "cold", I'd check the engine temp sensor wiring. The sensor (new, correct?) might work, but if it can't get its signal where it needs to go, it's useless. Are these engines equipped with an oil temp sensor as well?

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.