lets see.my guess, is you unplugged the USA, j20 engines coil pack wires.and the coil is not marked, (unless you buy a new one)the new coil is marked, 14,23posted this here many timesthe PCM sets the firing order, and you match it.1,3,4,2 is the order but that is hard coded in the PCM brain.do a search on this forum only last week i posted a photo of the new coil and those numbers on the side. now one more time, here it is ,if you need a photo fastwhat i do , is goto rockauto.com (not spam)the pretend to buy the coillook.see all those coils , one will be marked, with correct cylinder numbers,14,23, you only need to know which END is #1noting more. and that #1is the cylinder closest to the engine belt pulley end.works most the time.if not try other autostores. and look.added:"the J20b engine is this car, I thinksome have VVT cams, im answering for USA cars only, ok i did it for you, the MAKER SMP does this nice thing. here is the photo.see those arrows, those numbers are missing on the stock coil