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The 2008 Chevy Impala is equipped with a throttle position sensor, abbreviated as TPS, which is located near the butterfly spindle. This sensor monitors the throttle position closely and measures the airflow entering the engine via the intake manifold. If the sensor malfunctions, it will require replacement. Parts for the replacement typically cost between $33 and $87. If you opt for a professional mechanic or service technician to do the job, expect to pay an extra $86 to $129 for labor.
You can locate the throttle position sensor for the 2008 Chevy Impala towards the front of the engine compartment.