code

i rebuilt a motor for a 2001 sentra spec v 2.5l, everything is great but it keeps throwing a number 4 cylinder missfire code but while your driving it it doesn't feel like its missing. the damn thing drives great. i was wondering if it was possible if the timing chain is off one tooth it could cause that. when i put it together i spun the motor around and the timing lined up twice so i would think that its fine. do these coil packs go bad often? maybe its just a coincidence that this happened i don't know if anybody knows anything let me know please

does anybody out there have an idea, or know if there is a common problem with the coil packs. if so please let me know

i guess nobody knows any information, well when i figure it out ill post the solution so then eveybody will know