Weird problem on s40 2001

[nacker]

Hello, i have a 1.8 2001 s40 with automatic transmission. Here is the problem:
While the car goes on the way(gear in D), when i release the gas pedal, sometimes engine acts like i put the transmision on 3 or L, its like engine braking. And rpm is waving. The car is fully normal on accelerate and stopping both gear in N and D.
I checked the shifter position sensor its ok.(Trying to start the engine while shifter isn't in N or P)

Do you have any idea?

(Sorry for bad language )

[difflock54]

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