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I have a 73' 350SL (3.5 gray market) that has always surged at idle cold, then smooth warm. Aux. air valve is functioning creating high idle, then it lopes or surges like its lean. Checked coolant sensor - ok. Don't know what else it can be. Help
 

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73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
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I had the same issue with my 4.5. I replaced all the vacuum lines and solved the issue... Those plastic lines are available at a local parts store. If you go down this route, be sure to replace the rubber connector bits as well. They often crack with age.
 

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2004 S500. 2000 CLK430 Cab, 1999 C43 AMG. 1999 S500. 1999 S320. 1977 230 4 spd, 1972 280SEL 4.5
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Also, make sure that the throttle position sensor is functioning properly. You should be able to hear it click when the throttle is released from a very slight opening.
 
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