My car is well-tuned and running, tires up to standard pressure, brakes new and don't stick...even with a first gear start module, I'm getting 15 MPG/17 highway and I don't baby it. I think you have a vacuum leak somewhere.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm