While it is true the one vacuum line was off, reconnecting it did nothing. So even as I know I have to check for a vacuum issue, the "all of a sudden" shifting problems does seem to point toward the kick-down switch potentially sticking during that hard acceleration.

I will just have to go back with hoses and vacuum gauge to find out what is happening.....plus plenty of tools and patience. If I can get it home then I have a warm garage to work on it.

Thanks to all, especially Mark, for the comments and suggestions. Any other thoughts are most welcome.

Frank

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old goat

86 300SDL - 207K
84 300DT - 298K - sold
78 450SL - 97K
61 Porsche - rare T-5 Karmann Hardtop - NO, NOT a Karmann Ghia
99 Suburban 4x4 - 247K all original, the family donkey