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Enhancing Fuel Economy/Performance
I'm looking for some input as I don't have first hand experience with this; I just bought a 2004 Silverado 4x4 and was curious regarding PCM reflashing for fuel economy and performance, particularly economy as I'm pleased with the power. Do any of you have sug... Login to read more. 
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| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2004 Chevrolet Silverado 1500 5.3L
| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
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