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2 problems?
Vehicle has a P0171,P0174. STFT is normal. Swings between -3 and +3% at idle and cruise. LTFT is 15% at idle. During cruise or when I step on the gas in the bay, LTFT goes down to 8% and no lower. So me thinks vac leak maybe. But why wont the LTFT go to zero? ... Login to read more. 
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| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2006 Chevrolet Express 3500 6.0L
| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
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