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From what I have read it definitely sounds like a cam phaser issue. It didn't sound like it was a terribly difficult job and it seems that some have corrected the issue by adding springs.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.