Engine codes: Cylinder 3 and 6 misfire. EGR low circulation

[Patdon10]

Hey all,
I'm not much of a Ford guy, but I'm helping my friend out with her truck. Ford expedition. She wants to get it to pass emissions, but she can't pass with the check engine light on.

My first question is: If I simply attach an OBD-II reader to the vehicle, If I erase the codes, will they be off long enough to pass emissions.
Is the tester able to see that the codes were simply erased?

As to the actual fixing. 1st and 2nd code are a misfire on Cylinder 3 and 6. What I know about these cars is that this problem leads from a bad coil. So I'll need to change coils 3 and 6. Does anyone know where to get these online at a good price? Pointing me to a link would be greatly appreciated.

EGR low circulation? Sounds like it just needs cleaning. Where is the egr on this vehicle? What hose comes off and gets cleaned?

Thanks in advance.