620ti rev issue

620ti rev issue

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Hi guys and girls bit hard to explain but to the turbo out yest and when I hit boost hard and then come off the throttle my revs hold. They won't drop until I blip the Throttle any ideas ad gotta make a journey from Kent to Blackpool as am moving in the next week. I was thinking poss the stepper motor because that don't shut down for few min after I turn car off

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620ti rev issue