At the 4 hour mark, check the tenderness of the chicken, if tender, go ahead cook the egg noodles in a pot of salted boiling water to just before tender, drain well then add to the slow cooker and mix them in, add a bit of water if needed, make sure the noodles are submerged in the sauce. Cook for another 20 to 30 minutes, season with salt and pepper to taste, serve. IF the chicken is not tender, wait an hour, check the tenderness, if ok, proceed with the cooking the noodles as stated above and go from there.