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2003 4.8 Lean Codes
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Question
thearizonacowboy
Trying to track down the cause of a couple lean codes on my 2003 4.8 Silverado 1500 (P0171 and P0174).
So far I've replaced the fuel pump, fuel filter, spark plugs, intake gasket, intake tube and all rubber, and the MAF.
Cold start it knocks like crazy and feels like its going to stall out. Once it warms up after 15-20 minutes on the highway it runs significantly better.
After unplugging the MAF it runs perfectly. Smooth idle at cold start and has plenty of power...
Any help would be appreciated!
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