if you suspect an air leak at the manifold, try spraying some carb cleaner around the gaskets & hoses in that area, if the revs pick up momentarily thats where your leak is. if no leak is found, try clamping/blocking off the hose at the actuator & take it for a test drive, if it goes like a rocket, get it set up. warning:the turbo will be allowed to boost excessively & can harm the engine, so dont go mad! if you hear any pinking/rattling ease off!