What you can do to LIMP it to a tuner is to change the water temp setting.... So you can lean out the car while under the normal temperature. If that doesn't work you need to start scaling your injectors up so it doesn't read too lean. have it around 13 or 12 to get it LIMPED to there.
All this I hope you have a really good wide band and none of that APEX'i narrawband crap.
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Turn and Burn!
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