I don't know. I'm not dating or even looking to date right now. In hindsight I think I didn't so much follow 'sparks' as follow the men I felt comfortable with - which was people more messed up then I was. I was incredibly uncomfortable with the few 'healthy' men that showed any interested - which said something about me, not them. I also didn't choose people - I simply let them choose me and didn't make any discrimination about what was good for me, or what I wanted/needed. People here talk about lists. My list looked sort of like this "Does he pick me?" End of list.
However - you seem to have a gut feeling. I had a gut feeling with my xah and I totally ignored it. I call that feeling an inner voice and I could no longer even find mine. My vow is to always search for and respect that voice in the future.