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Hi,
First off all is it a manual or automatic gearbox?
When you let go the throttle above a certain speed, the injection times of fuel are determined by a fixed table. Under a certain speed the O2 lamda sensors in combination with the airflow sensor. take over again.
It could be that the lambda sensors or airflow sensor are too far gone and that there is a jump in injection times when the engine switches from the table to the lambda control.
This could result in a ramp up of the revs.
You can check the lambda sensors with a oscilloscope.
Regards Maurice
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