I would also look into pulling the plugs for inspection. That will tell you which cylinder is burning oil, running rich and/or lean. You mentioned that you've replaced one coil pack already... What about the other 5? You could have more failing coils especially being that you have over 200k on them.
How are the injectors? Seems like you have multiple misfires to me. If it starts, idles rough your timing is fine. You either have bad plugs, coils or injector. Also look at cam and crank sensors for the stalling. Keep us posted and let us know what the codes are that way you can get better answers.