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I'd still do a compression check. If they aren't coming out wet/stinking like gas after cranking for a few minutes, you have to figure that out too. You did verify spark though but I agree it could be swapped. Honestly, why not swap the plug wires the best you can so coil 5 goes to cylinder 1 and coil 1 to cylinder 5? Beats tracing out wiring and should answer your question pretty quick. You'll definitely have to help the car idle until it starts getting up to temp, first start problems. It should be obvious though if it is running like **** that you have issues still.
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