I'm having an issue with my 2011 it has misfire codes for all the cylinders but 5. I've replaced the plugs and coil packs. I tried clearing the codes and the show cleared, then it is hard starting after the codes are cleared and once it starts the codes come back. What should be the next thing I look at? There are no other codes coming up just the misfire cylinders 1, 2, 3, 4, 6. The code numbers are P0301, P0302, P0303, P0304 and P0306. I'm sorry if this has already been asked but I couldn't find it.