Hi All,
Hope one of the guru's out there can help, I'm rebuilding a 280SL that has been laid up for 15 years, and have got the motor running however it's idling really high (2200-2500 rpm) and running roughly and is also "hunting". The fuel pressure is correct and I've replaced Fuel pump, filter, also replaced Plug, Leads, cap and rotor. I'm beginning to think it may have a Vacuum issue??
Can any point me in the right direction or at least give me something else I should look for.
Many Thanks Russell

Yes, sure sounds like a Vacuum Issue. There a few locations where Vacuum Lines connect to the Manifold. Make sure these are all plugged or connected to the proper Lines. Did you replace the Manifold Gasket? If so is it the correct one.
Does the engine have even compression in all cylinders? Is the timing correct?
Just some starting point thoughts

__________________
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd

smoke test the intake manifold

also what year is your 280SL? Is it a D-jet or K-jet car?