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Hks vac

After fixing the VAC on my ISF, the IS-F logo was blinking on the VAC for few times and then it is stop blinking, that means everything is ok as per the catalogue.
On the Idle when start push the Gas, the RPM is moving up very slow.
When driving the car, the performance is VERY bad!! Without the VAC the car is much powerful.

Please advice if someone know any solution

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