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EFI cars dictate idle through direct output from the ECU, based on information it gains from the coil, engine temp (block sensor), cam revs (sensor) and throttle position sensor (on the throttle, a potentiometer usually). Idle is actually controlled by the ECU based on that info through a throttle bypass solenoid valve. This valve can get dirty and you can tell if there is a fault if the idle does not change on engine load (like when the aircon goes on). Take the valve off and clean it. The TPS sensor can go wrong also as the ECU then does not know what the throttle is doing. Hope that helps

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Q: Why does 1995 eldorado's idle fast or hunting for idle?
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