I have a 1980 280SL Euro car. Right now she suffers from hard shifts. It's my feeling that this is probably due to a vacuum problem. I had some work performed by an indy and the problem arose subsequent to that. Additionally, there was a vacuum port at the rear of the intake manifold that was open. Any help or suggestions would be deeply appreciated. Thank you in advance!

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Roc

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Maybe the feed to the transmission modulator was knocked off during service. No vacuum to the mod equals hard shifts

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I'm not a doctor, but I'll have a look.

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