Q: MAF sensor throwing code, running lean. The dealer is saying the ECM needs to be reprogram. Is this needed?

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MAF sensor throwing code, Engine is running lean. The dealer is saying the ECM needs to be reprogrammed after new stock MAF is replaced. Is this needed?
My car has an automatic transmission.

2004
Silverado 1500
Chevrolet
V6-4.3L
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