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Idle is normal, mine idles at bang on 600 warm.
Misfires don't have to come from the spark plug or coil, it can be fueling or mechanical. If it takes 200 miles for it to come on then it's going to be a pain in the ass no matter what it is, but since it happens on cold start (when it has to run richer) I'd lean on the fuel side of things. I don't know if they know, but with a decent scan tool you can +/- the injection amount to force it into having the issue.
For example, if it's missing during startup enrichment because an injector isn't injecting enough, you +++ the injection amount and the one clogged injector and it's cylinder run fine while the other 3 run filthy rich and miss.
You can test both DI and PI like this, so if it's fuel related, the tools are there to make some sense of it.
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