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One of the following:

23 Manifold air temperature (MAT) sensor - signal voltage

is low or high

Throttle position sensor (TPS) error

Intake Air Temperature Sensor (IAT) low

taken from http://www.fullsizechevy.com/forums/general-discussion/tech-articles/31857-how-extract-trouble-codes-obdi-up-95-a.html

and modified slightly based on car info given

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Q: What is code 23 on a 1993 buick park avenue?
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