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A cam phaser is just a sprocket that adjusts the position of an engine's camshaft in relation to its crankshaft. So it’s main job is adjusting the position or the “phase” of the camshaft in relation to the crankshaft, thereby altering valve timing. A VCT solenoid, AKA the variable valve timing...

I have the exact same issue. (2018 GT 10Speed, LTH & catless mids, P51 Intake and tuned on E85) 65k miles After constants logs with Lund they narrowed it down to VCT Solenoids and or Cam Phasers. Apparently it’s not rare on our cars..