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Gen 3 Prius rough cold start plus slow coolant loss

PistonBuilder78Community StarterMar 25, 20262013 Toyota Prius ThreeLos Angeles
Older Prius has developed a rough shake for a few seconds on some cold starts and the coolant level seems to be dropping slowly. I don't want to assume the worst. What test sequence would separate ignition, EGR/intake issues and an internal coolant leak? I'd rather test this logically than start replacing parts. What am I missing?
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