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would an unhooked IAT sensor cause improper shifting

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IAT sensor was not hooked up
Vehicle: 2004 Chevy Cavalier 2.2L

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Yes it will what you set is a circuit high, depending on its fuel strategy a circuit low. The IAT is used by the transmission shift control. what is encountered is a harsh upshift., you can expect this type of condition with Saturn and Cavalier.

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