Running Rough Still...

[jakestachel34]

I recently changed my spark plugs and coils and upon replacing them, my X5 would be running about the same as it was before I changed them. I took it to a shop to see what was up and they said I needed to replace the valve cover gasket (b/c of oil in cylinders). The mechanic also suggested I replace my fuel injectors b/c when it would start up, it would start rough and then idle out to be fine once it warmed up. I drove it home and it was driving fine but the next day when I started it up, the misfires came right back. I did just put some injector cleaner in the X5 which helped a little bit, but my CEL keeps blinking after I start driving. I plugged in my CARLY adapter and these are the engine codes that pop up.
0029CC (misfire, several cylinders)
0029D4 (misfire, cylinder 8)
002E2B (ignition coil cylinder 8)
Why would these still be present? I have cleared the codes a few times and they still want to stick.