91 s10 idle speed

I have a 91 s10 4.3. It just started to idle to fast,runs greatother than that.Can you give me hint to what may be the problem. It has throttle body fuel injection. Thanks.

mine does same thing in summer it will idle high then as it warms up it will drop. now this winter it idle high and i sprayed penatraiting oil on gas cable and it's back to normal now. how long do you let it run to see if it will idle down?

i just purchased a 1994 s-10 and mine was surgeing while in park so i cleaned the egr valve and put in a new tomco gasket and it solved my problem