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  1. Chevy Silverado Forum (GMC Sierra)
    I've replaced almost every component that has to do with fuel/exhaust system to try and fix this problem. Mass air flow sensor. Oxygen sensors. Fuel pressure regulator. Fuel pump. Fuel filter. Spark plugs and wires. Cap and rotor. IAC valve. MAP sensor. Ignition coil. Still had codes and running...
    brake booster fuel trim lean
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