There are two different types. One you can pull the spring back and turn it in and out, the other you can kind of rock it back and forth while you push in on it.
Another way is to run it in and out while you have the engine running.
See my post in this link how to do it about a 1/4 of the way down. http://www.fiero.nl/forum/A...060811-2-073281.html
You use your finger to vary the amount of air being sucked in which will change the engine idle. Slow the idle down and the pintle will pull in. speed it up by allowing more air in and it will move out. When you get it where you want it have someone turn the engine off.
Takes a second to get the feel of letting the air in but once you get the hang of it, it's kind of fun to play with the speed.
Don't want to do it with a hot engine of course.
[This message has been edited by Dodgerunner (edited 04-21-2008).]