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I would check for faulty grounds first, if they all pass, then check for faulty sensors. If they all pass then data log what your tune is commanding for VCT and what the engine is responding with for VCT. If they don't match, it's time to go back to the VCT solenoids. If they do match then the engine is poorly tuned and you need to properly tune it.
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Help them do what they would have done if they had known what they could do.
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