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If you drive the car without the ALDA installed, it will have full fuel enrichment at all times. On some cars this makes it undrivable. Or put another way, if the IP is good, the car *should* be undriveable. If it's OK with no ALDA, the IP is probably way out of calibration. (Note that I am not positive about this.)
On the tranny - when was the last time you changed the fluid & filter? It is required every 30kmi, or sooner if city driven. My cars would exhibit similar symptoms near 30kmi and after the fluid/filter change, it was perfect. Using synthetic ATF helps this drastically. If your fluid/filter is ok, you probably have a problem with the vacuum signal to the transmission. The 1986/87 models have a temp switch that softens the shifts until the engine temp gets over 50C. I don't know if the 1990-93 diesel 124's have this or not.
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