1991 ford ranger 4.0 high idle

[91 blue ranger]

Could it be the intake manifold gaskets? And how hard are they to replace?

 

[97ranger xlt]

literally any place that is leaking un metered air in can cause a high idle so yes. gotta find the leak(s).
no idea how hard to replace never done it.

 

[91 blue ranger]

Ok I just did not know if it was a sensor or not. I just think that it is weird that the truck will idle right after it is warmed up, but if up rev the engine it goes so high

 

[91 blue ranger]

When you unplug the iac the idle should drop to ~500, or even stall. Recheck for vacuum leaks.

Is this with the engine warm or cold?

 

[jcook100]

Hi 91 blue ranger, I also have a blue 91 4.0 and am experiencing the same issue! Were you able to resolve it?