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I'm sure someone will correct me if I'm wrong, but pretty sure the hot side of the coil should see battery voltage--it has on every other car I've worked with. I'd try and figure that out before replacing anything.
A problem I've noticed, and it's not just MR2s--once cars reach a certain age they develop corrosion in the wiring, and they corrosion is a lousy conductor. Once you find where the problem is, it often requires nothing more than cleaning a connection.
Are you getting good battery voltage everywhere else? Where I'm going here is, the easiest way to see 3v on a hot wire is if there's bad corrosion at the + terminal. Which can manifest overnight if it's humid enough. Also check your engine ground. Since the starter grounds through the transmission ground strap, the starter can turn even if you have a bad engine ground--and you won't get any spark without an engine ground.
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