You will need a special tool called a "fork" that pops the connection. Remove the nut at the end of the idle arm joint then put the fork in place and give it a few good hits with a big hammer. Of course you will complete the destruction of the idle arm, but you're replacing it anyway. After the joint is loose, remove the bolts from the frame and drop the idle arm and replace it.
Simply replace them. Make sure the pitman arm is bad before replacing it.
there is an "idler arm", its part of the steering and runs horizontal, as well as a pitman arm
check your pitman arm and idle arm
There is more than likely a problem with the idle arm censor that would cause this. There may also be a problem with the throttle body.
replace it
You need to clean (or replace - $200) the idle air valve.
clean or replace your idle air control valve.
The pointed end of the idle speed screw should be centered on the idle arm on the carburetor. http://store.chainsawr.com/
Currently it seems like you have no choice but to replace the complete arm, that is all I can find available.
loose rocker arm[s]
need to replace the fast idle valve. they are only located a the dealership.... good luck need to replace the fast idle valve. they are only located a the dealership.... good luck