I'd be pretty wary about this misdiagnosis; what else are they going to misdiagnose. I had serious doubts about random misfire events caused by clogged catalytic converter(s). Mistimed camshafts might be a slightly better candidate, but I'm skeptical at timing chain; it is unlikely for a timing chain to jump/stretch causing twelve degrees out of timing. I suppose I'll believe it when it's fixed and it doesn't come back.
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