Following a run out the other day the engine suddenly started to run lumpy. Code reader showed “multiple misfires”. Contacted ZMANALEX who advised I pull each coil pack plug in turn and listen for a change in engine note. I found it difficult to notice a change on any cylinder but eventually thought it might be cylinder 6 (note sure though). I ordered two used coil packs from him just in case. While waiting delivery read this guide https://my.prostreetonline.com/2019/02/22/p0303-nissan-3-5l