I just replaced the 2 fuel pumps on my 88 560SL. The car runs perfectly, but the idling is higher than what I like when HOT! It will idle perfectly at 700 RPM UNTIL it gets hot when it will go to 900. I have replaced the control module behind the dash, idle control valve, hot temperature sensor, and the OVP with no joy!
I also checked the vacuum lines.

Anyone with any other things to check?

Richard