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you use carb. cleaner and a shop rag . take the air intake tube off the throttle body. open the butter fly and clean all the black cabon off. you want to be carefull not to spray to much carb spray into the intake. you will have hard time starting the car if you do. sray in and wipe out till it's clean

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Q: How do you clean 2003 4.2 vortec throttle body?
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