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Twice this week my check engine light has come on so both times I ran a code tes on 2004 Chevrolet Silverado 1500

t with my Actron tool and both times it say my pick is running too lean. What is the cause and fix for this?

poss vac leak or mass airflow sensor. ck for vac leaks and clean mass air flow with proper cleaner. this would be a good start
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poss vac leak or mass airflow sensor. ck for vac leaks and clean mass air flow with proper cleaner. this would be a good start
You should have 45 psi on the fuel rail. If it is low, it will run lean. It could be a clogged filter or a worn pump.