Does the 560SL have an engine brake? When I release my accelerator at 35mph or higher, I feel the engine decelerating the car. It's not missing, it idles smoothly and doesn't seem to be cutting out. It's just a noticeable pull back in velocity. Anybody know what this is?

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1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)