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My thought are, you only have one Wideband. The Idle mixture will be different side to side.. so the lean you are seeing on the Drivers Bank, COULD be also a rich on the Passenger Side.. Only a Second Wideband will tell.. In that case it would LIKELY be a Throttle Body Adjustment on the Passenger side open too Far, as the Passenger Side T-Body controls the Air on the Drivers Side Cylinders.. Cj
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