Gotcha, if you're ready and willing to spend the money I completely understand. Just FYI, though, here's what I did on a 2005 V10 I recently bought. I had random misfires too and couldn't track them. I bought a couple new coils, all new coil
boots, a package of dielectric grease and 10 new Motorcraft plugs.
Pull all plugs and coils, one at a time, check coil with multi-meter (I learned how on Youtube), replace plug and generously coat both ends of coil boot with dielectric grease when going back together. This solved all my problems. The worst part of the job is pulling the fuel rail out of the way.
I got all parts from Rock Auto, plugs were $2.47 apiece and boots were $2.90 apiece, big tube of dielectric grease from O'reilley Auto parts locally. I would recommend this even if you're putting new COP's in.
Our fleet mechanic at work recommended this over the cost of all new coils and he was spot on. None of my coils were actually bad. I kept the ones I bought as spares.