Hi.
It`s worth checking the VVT Solenoid or Solenoids. It`ll only cost the gasket.
On high mileage / lousy oil change history engines these can be gummed up
and sticky. ( like the linear solenoids in the gearbox).
With the solenoid remove you can put 12V across it and see inside if the pintle is moving on a full stroke.
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