Yes, I'm still here. I was typing this out.
Those 3 codes you sent are:
Gas Recirculation Control Circuit
P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor A Circuit Low
So something came unplugged on the EGR or the wire is shorted. There is definitely a circuit issue going on there. Check the plug and push in on the wires to make sure they are good. Just hope that the EGR didn't go out on you when cleaning it because that is the next option.
P0269 Cylinder #3 Contribution/Balance
This basically means the injector is not fueling properly. It is trying to compensate and it is either overfueling (do to failed internal parts of the injector, like a broken spring) or the solenoid is bad and it needs to be replaced.
So you are looking at two parts if you can;t find an issue with the wiring on the EGR. An EGR valve and a injector for #3. Neither of these are going to be a quick fix. :-(