sr20 blacktop idling small pop/backfire

[02vtecsir]

i have a blacktop,at idle it will single small pop here and there, i just fixed the cam angle sensor and it didnt really do it before. it wasnt put in correctly before, i installed it and aligned it correctly, but since them its been doing this

i noticed that once of the coils has a crack in the plastic, could this cause it??