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Bad start, won't pull at higher rpm
Vortec 5.7, high mileage, needs extra fuel to start cold,
and feels like a MAF or plugged cat. Known good maf, checked
backpressure on both cats, under 2 psi. 
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15 Replies Received
15 Replies Received
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1997 GMC Yukon SLE 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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