Rough idle, strange error codes

[BrianCanFixIT]

2000 XLT 4.0 OHV, 4x4:
I've had my truck for over 10 years now (I bought it used) and I'm just starting to get the following three error codes:
P0401
P0301
P0000

I realized that my truck has no EGR system, yet it has a California emissions sticker.

When i bought it from ford the heads were blown; Ford replaced one under warranty, and I replaced the other. It's been running okay but never great. As you can see an image below there is no EGR system/DPFE sensor.

I've reset my odbii, but the codes come back as soon as I stop in traffic & idle under a load for more than a minute.

Any ideas how to fix my truck? I was thinking the coil pack or possibly the fuel injector.

Thanks for your help.

Brian

 

[James86]

is it possible you have the wrong topend, or maybe wrong computer?

 

[zacharry]

you have the picture of the right stuff the intake, that roundish aluminum thing under the 4.0 on your plenum, that is you idel air control valve, on diffrent vehicals they are diffrent names however they all do the same thing, take that off and spray some mass air flow sensor cleaner in there see what happens. also clean your mass air flow and look for vacuum leaks with a can of starting fluid or carb cleaner. that looks like a plastic plenum so you may clean it and check for leaks on that thing. the plastic was a mistake for ford.