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Old 06-17-2017, 08:22 PM
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Bad 02 sensor would cause that one bank to run poorly and most of the time generate a code. Bad cat would have also result in symptoms on that one bank. Doesn't fit all the symptoms of a vacuum leak I would use propane or carb cleaner to check around the engine, especially the intake and check the air intake tube for a crack.

Can you monitor short and longterm fuel trim?
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