My 300D (turbo) is having trouble shifting. When it should shift smoothly into gear (usually between 2nd and 3rd or 3rd and 4th), it jerks like it is trying to shift into gear but can't. It's hard to describe, but the car visibly lurches during shifting. Eventually, the car will shift into gear, but it sometimes takes a while.

Anyone have any ideas of what we could try?

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"Mischief" - 1983 300D - troublemaker with a big heart.
Currently in storage due to a transmission that was never reconnected by a now deceased family member and a hole in the floor the seat is easing into.