Okay guys, I know I have a very big vacuum leak but have been unsuccessful in finding it.

Details: 1986 560sl, 166k miles. Idles just a little rough although not enough to really even notice (I notice because I know the car) but the "economy" gauge is always pegged to the right. However, when I put the car in reverse and step on the gas, the needle moves to the left (like it is working normally only in reverse). Is there a vacuum line to the tranny that might be causing this? Or does anyone have any other suggestions? Thanks!!

Stix

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1986 560SL Silver/Burgundy