What motor do you have? How many miles? Are those the original plugs? Why change only 2? What condition were the coil boots when you removed them? Did the PCV and hose assy get moved when you changed the 2 plugs?

You're a little vague or maybe I'm just confused about past and present codes, so I suggest you disconnect the negative cable from the battery for a minute to reset the codes. Then drive it again for at least an hour if you can then check your codes again.

A miss fire from a weak coil may not throw a code.

Check the condition of the PCV elbow at the rear of the intake manifold.

Check the fuel pressure.

Make sure you connected the injector and coil connectors.

Clean the Mass Air Flow sensor but don't damage it as it's delicate.

If they are the original plugs, change all 8 then clean and apply dielectric grease to the coils. Inspect the boots for cracks and replace if necessary, but only replace the boots if it is determined that the coils are OK. You may just need a set of plugs and coils.