Hey guys! I've been lurking here on and off for awhile, but now I need some information.

I have a 2011 Crew 5.7 68k miles on it, and its giving me codes P0300 and P0305. I changed the plugs to a new set of autolite platinums, gapped at .044. I also changed the 3rd coil from the front, driver's side and the problem just keeps getting worse. I can drive all day after clearing the codes as long as I stay below 2500 RPMs and it will shudder on large hills, but never set the code. As soon as I have to accelerate more quickly then the codes occur again.

I thought it might be the ESIM or purge valve, but I really don't want to start replacing parts without getting some advice here first.

Thanks in advance.