I have OBD error code p0171/p0174 on 2003 Chevrolet Suburban 1500

Had error code p0171 a 6 weeks ago and the auto shop replaced the MAF sensor. The engine light came on again and now reports p0171 and p0174. The car is seldom driven and has maybe 300 miles on it since the MAF was replaced. I read your article, but how should I proceed?

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