I think it can do - if you want it to. I'm assuming by "spark" you mean that you and your other half don't seem to have a romantic, exiting, sexy relationship anymore, and you feel like you've gone off him/her.
There's always the obvious option of going for couples therapy. Maybe you could try going away on a romantic break, if you've got kids, leave them with someone trustworthy and enjoy the fact that it's just the two of you.
How long have you been together?