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Random thought: could the tps or ignition timing be at fault? a vacuum leak? I kinda doubt the exhaust leak is to blame for something like that, unless the pipe is falling off. Have you checked the voltage at the O2? Til you check the O2 it could be anything, just that by unplugging the O2 you are bypassing the whole closed loop system, wherever the issue may be. Do you get a Check Engine light, or any codes?
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