Since I did the rebuild on my W126 M103 the idle has been at around 550 to 600 RPM, it's not as smooth as I like it to be. When I push it to 700/750 RPM it smoothens out and the oil pressure gauge goes up to 1/4. How do I set the idle speed to 700/750RPM, where I believe it should be on these engines?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).