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If I were you I'd ground the VTC's as a test just to rule them out. Just tap into the yellow wire at the VTC and touch it to a ground point. Won't even take you 5 minutes.
You don't need a write up. Simply splice into the yellow wire on either VTC harness and ground the other end. Easiest place to ground it is at one of those 10mm bolts at that fuel rail bracket right over the water neck that connects to the radiator hose.



