If your car is highly modified the PFC computer will not learn to idle using the ISC .but you can get a car to idle by setting the computer ,timming and throttle body settings correctly .My car would to idle with the ISC hooked up if the AC was running .If the AC was turned off then the ISC did not control the idle .Steve Kan was staying at my house years ago and he disconnected mine and told me the car would not learn to use the ISC .To get a computer to learn to idle the car needs to idle for 15 -20 minutes with the ISC clean and pluged in .
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