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Q: What is causing the car to jump when shifting from N to D? on 1990 Lexus LS400

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I feel a sudden shock (jump) when I shift from N to D
This problem happens only when the car is stopped and I shift from N to D
This is not happening every time, sometimes the shifting from N to D is smooth
Otherwise. the transmission is shifting very smoothly between all gears at all times
Thanks for your help
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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this could be several issue from motor mounts to high idle, and poss trans issues.seek a diag at aamco for free to make sure trans is ok then move to poss other issues
Thanks for your help,
Idle speed is normal, no error codes for transmission but sometimes I hear a loud sound of "whistling" when starting the engine in the morning before engaging transmission, this sound goes away after sometimes
I think this sound coming from oil flow which is stuck somewhere in the transmission
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