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Originally Posted by Pete_89T2
That's actually good news - the engine dying intermittently at random sounds spark/electrical related to me. Chances are it does NOT need a rebuild yet; get the electrical gremlins exorcised and it will run/last a long time, even with low compression.
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You didn't mention it, but first thing I would do is verify the alternator is working properly. Sometimes we get lucky and it's the easy fix.
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I'm not too familiar with the RX8's, but I recall hearing somewhere on here that they are known to have issues with the coils/ignitors going bad, and I want to say there was a TSB/part # change to deal with that. A failing coil would cause your engine to die at random. Someone else more knowlegable about the RX8's can probably elaborate.
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The coils on the 8 are garbage. They seem to last ~40k miles if that. If that car has the original coils they DEFINITELY need to be replaced. I would also have someone verify that you got the correct spark plugs from the mechanic.