I have replaced the ignition coils on the 5th cylinder, but the check
engine lights keeps repeating the P0305 error code. I have also
replaced all the spark plugs on all 6 cylinders and the error still
reoccurs after I clear it out. Is there something I am missing? Does
the onboard computer need to reset itself after a couple of runs? I
would certainly appreciate any advice.

Out of curiosity, is the 5th cyliner the left most cylinder on the bank
closest to the firewall (without the plastic cover) when I have the
hood open and facing the engine? Thanks for your help.