I have a 2005 F-150 STX with a 4.6 that has rough idle. I changed the Spark Plugs, Air Filter, Fuel Filter and cleaned the throttle body which was black. I plugged in my scanner but no codes show. Could it be a bad injector or COP?

 

Search iac. Your lucky and have one i dont (5.4).

 

I cant find where the iac is located, is it near the TB?

 

Top right hand corner of the screen search button. Click it search Iac. It will give you w.e you need I'm not sure where its located.

 

i tried and couldnt find it still

 

Our trucks don't have an IAC . The closest thing to an iac our trucks have are the actual throttle
Body motors on the side of the TB. And let me tell you, it is not a cheap fix

 

The iat sensor is an integral part of the mass air flow (Maf) sensor. If the iat sensor must be replaced , you must replace the Maf sensor . (That's from the Haynes repair manual ) .. Have u tried cleaning your Maf sensor ? I solved a rough idle on my 4.6 by replacing the egr valve after trying basically everything you have.

 

I would suggest trying this first
https://www.f150forum.com/f72/batter...rocess-133736/