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If you had the battery disconnected then the computer has to relearn the optimum efficiency for everything that's going on. If you didn't disconnect the battery, then you should do that for about 30 minutes and clear the computer out so it can relearn with the new MAF sensor connected.

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Q: Why does a 1997 ford ranger V6 4.0 still idle rough for a few minutes until it warms up after changing mass air sensor?
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