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On engines of my generation, if you wanted to adjust the idle speed there was an idle adjustment screw on the carburetor to bump the idle up or down as required.
On these newer fuel injection engines with computer control, how do you adjust the idle speed.....have screw driver in hand ready to adjust...:-)
I think my ranger could us an idle adjustment but I'm lost.
Yes the info RP mentioned is def a requirement to give the right information. If at idle its acting wierd try just cleaning up your IAC and see how it runs after that.