You owe it to yourself to put Trans-X in it, drive it a bit, and change fluid and filter. Don't forget to drain the converter also. Would be a good idea to check pressure at the modulator also.

The problem you describe could be caused by a gummed up valve body. It could also be caused by internal leakage due to worn parts.

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You can get farther with a smile and a gun than you can with just a smile.

1984 300D
1985 300CD
1980 300SD
1993 SL500