One thing I forgot to mention. The problem used to be intermittent. Maybe a week or so it went away for a day and then it was back. Or before, sometimes if I brought it up to 60 and shifted back and forth a few times between 3rd and 4th it would go away. But now it looks like it's here to stay.

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."