My 01 maxima started misfiring last week I feel it when I'm stopped at a red light. I checked my check engine light only code came up was a po430 code. I checked my spark plugs none of them had any oil on them but I replace them with NGK plugs it was time to change them. After that I still had the misfire. I did the coil check by unplugging them one by one and didn't feel like any were bad.

 

The code is unrelated. Isolate the misfiring cylinder and swap coil packs and see if the misfire follows the swap.