The hard shifts and the door locks are both due to a failure in the vacuum system. You probably have a broken rotted, or disconnected vacuum line somewhere. As Jimmy says, you need a MityVac and a copy of the vacuum diagram from one of the links at the top of the page. It is a slow process to trace through the whole thing but that's what you need to do.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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