Idle Speed Contact Switch

[96C280]

Where is it and what does an IDLE SPEED CONTACT SWITCH do?

My car's idle is tending to surge a little at start and but mostly when the engine has been warmed up. Doesn't come close to dying but more tends to be roving and surging up for no apparent reason.

Is the switch part of the assembly that includes attachment to the bowden cable? There are 3 places, I believe, that you can make adjustments including the bowden cable. What are and how do you determine the proper adjustments for these?

Thanks.