Q: 2012 Nissan Altima rpm after an hour stays below 2500, already put new maf sensor what else could be the problem?

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The rpm drops after an hour of driving to below 2500. Already changed the maf sensor after AutoZone checked it, but the problem still occurred. Was told it might be the cadilyct converter but need a second opinion.

My car has 180000 miles.
My car has an automatic transmission.

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