In the olden days, everbody had a carbuerettor, and they all had an idle air bypass screw and a throttle stop, and that's how the tech could set the idle.

Not so anymore, now we have computerized fuel injection, and lotsa different ways to adjust/control idle speed.

Idle is set by a screw, an Idle Air Control motor, the ECU computer, a vacuum valve, a throttle position switch, and maybe even more thingies I can't think of.

To set the idle one must know the year, engine, and maybe the model, too.

Post back with that info, someone will give you the right stuff.

Regards,

Bob

:>)