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you need to clean the throttle body...sounds crazy but it worked on my 04...everytime we would turn on the ac or defrost the engine would want to stall out,,,but if the floor heat was selected it would run fine....buy a can of throttle body cleaner and spay a rag with the cleaner and wipe down the butterfly on the throttle body DON"T SPRAY DIRECTLY INTO THROTTLE BODY!...MAKE IT AS CLEAN AS POSSIBLE...it'll take about 10 mins start to finish and you"ll be amazed that it worked.

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Q: Why does my 2002 envoy idle up and down when you turn the heat and ac on then turns off?
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