When is the last time you changed the fluid and filter? That is always a good place to start with trans issues. Also a bottle of Trans-X can help when you refill the system. It will clean the varnish off any parts that have build-up and can help the situation too.

I'm not too familiar with the 124's, but shouldn't too much vac cause all shift points to flare? I would suggest the K2 spring. I has a pretty good flare in the trans on my 123 wagon, which I cured with a new K2 spring kit.

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