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Re: Dave's Evo X Build/The Life of Dave blog
Probably not an O2 sensor if both are reading lean. Your fuel trims are maxed out on the positive side right, it can't add any more?
I would guess this is an air metering problem if your fuel pressure at the rail is good. Maybe an air leak pre-turbo but after the air sensor? Have you gone into boost? If it goes super rich under boost you may have a massive air leak somewhere, letting in extra air under vacuum and letting out air under boost.
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