p0305 misfire 5 but it only misses at hard acceleration. light is on all the time tho.

Question

what would cause it to only run rough at hard acceleration. at idle it feels normal.

Answer 1

Hi there

Try swapping the ignition coil with the one next to it. A coil can sometimes only fail under certain conditions. If it's the problem it will move the misfire code to the new cylinder. It's the most common and likely issue to be honest.