1994 318i M43 148.000 km

I have a little problem.
If i change gear, the RPM drops to late down ( not fast enough).( about max 1 second) What can it be ? The acceleratocable ?
The motor runs verry nice.
In the garage,workshop one airvalve have been cleaned, no soloution for this problem.
Who knows this problem ? Please help me.
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