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Q:

how to change the idle air control motor on 1992 Dodge D150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the engine idles up and down while in park
(1) Answer
Best to inspect why this is happening, you may have a vacuum leak, bad oxygen sensor, sticking EGR valve etc, and the idle air motor is 'chasing' meaning it is trying to keep the idle with in spec, but other factors are interfering.