I just replaced all six fuel injectors and cleaned the throttle body on my 95 ranger 4.0ohv. Now it’s idling at 2700 rpms with the iac plugged in.

 

Welcome to the forum

What about with IAC Valve UNplugged?

RPM is controlled by air flow on a gasoline engine, IAC Valve is used as a Controlled "vacuum" leak
To get above 2,000rpm you need a fairly large air leak or throttle plate is not closed, disconnect throttle cables, both of them if you have cruise control

Check PCV valve and hose, and power brake booster hose, those are the two larger vacuum hoses

With engine running spray soapy water around the fuel injector area, lower intake, to see if engine stumbles when it sucks in water

 

As I stated in the first post it is a 1995 ford ranger 4.0 ohv. So the older motor. And with the iac unplugged it idles at 1000rpms. Replaced it today and it lowers the idle down a little bit but I’m still noticing considerably high idles unless the iac is unplugged.

 

Engine needs to be warmed up first
Then unplug IAC Valve, RPMs should drop to 500 or engine may stall, either is GOOD

If idle stays high then there is an air leak, or throttle is open too much

 

Alright. I will try that. Thank you. I’m resolving a vacuum leak currently. And if that doesn’t fix it I’ll try that.