hard start on 1990 Mercedes-Benz 420SEL

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

Asked by for the 1990 Mercedes-Benz 420SEL
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.