both answers are correct..
I have had cars that when the ac was on it stepped up the idle with this.
I like to keep a couple around for those high compression deals with big cams that will not idle under 1000 rpm..Use it to adjust the idle speed against when energized ...back the regular idle speed screw all the way out...when you kill the ignition power the solenoid drops out ....the throttle blades slam shut and NO air enters the intake ...Car dies instantly....
Really nice to have for that.
Last one i used it on had 245 PSI cranking pressure.that one would not diesel..it just ran like normal when you turned off the ignition...
I have an old McCullough chain saw that when hot will not shut off..it will be like a runaway engine with no spark...I have to pull the choke and then it will die.
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