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Q:

hard start on 1990 Mercedes-Benz 420SEL

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
1989 420 sel new valve job having problems hard to start when cold and after driving up to normal temp also the eco neelde stays in center when at a red light and the car is in gear
(1) Answer
Sounds like you need to take it back to the place that did the work. It sounds as though the valve timing maybe improperly set.