I'm not sure about $4F... but $42 you also had to change some IAC parameters to add IAC counts to make it work.
The purpose of it all is not to increase RPM when AC comes on! Not to raise them. It's actually dangerous at a traffic light with foot on the brake and AC comes on and RPM increase a little makes you roll into car in front of you... well almost if your not paying attention and increase brake.
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