My car is an '87 Euro 300D.

While coasting with foot off the accelerator pedal, my transmission sometimes downshifts but sometimes doesn't, when I move the shift lever to a lower gear.

But if I step on the accelerator pedal a bit, the tranny downshifts to the selected lower gear.

Is this normal? If it's not, how can I make downshifting while coasting more consistent?

In all other driving conditions, like when accelerating, my tranny upshifts and downshifts normally.

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Jake