Depends, sometimes faults don't throw codes straight away.
^^^X2 on it possibly being the IAC. Take it out and clean give it a good clean. Do the throttle body while you're at it.
Here's a couple of pics of my IAC from my 4.7 V8. If you're engine is different the layout won't be the same but will more or less be the same.
Apologies for the crappy photoshop!
The part circled '2' is the IAC. The part labelled '1' is the connector. Disconnect the plug and the unscrew the two torx screws (T20) holding the IAC in place and pull it out...
If it's dirty it'll look like this...
Give it a good clean and re install. You should see a noticable result and hopefully a total cure
Should only take 10 to 15 minutes. A lot easier and cheaper than doing the fuel filter.