How do i fix a throttle position sensor on a 91 Chevy Lumina? ?

[chicagoctyby]

where do i look at to find the sensor

 

[mike D]

Under hood, driver side, upper engine area, mounted on front of throttle body unit
http://www.autozone.com/az/cds/en_us/0900823d/80/04/f8/e2/0900823d8004f8e2/repairInfoPages.htm